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Phytotaxa 255 (1): 021–033
http://www.mapress.com/j/pt/
Copyright © 2016 Magnolia Press Article PHYTOTAXA
ISSN 1179-3155 (print edition)
ISSN 1179-3163 (online edition)
Accepted by Eric McKenzie: 14 Mar. 2016; published: 5 Apr. 2016
http://dx.doi.org/10.11646/phytotaxa.255.1.2
21
Licensed under a Creative Commons Attribution License http://creativecommons.org/licenses/by/3.0
Chaetothyrina mangiferae sp. nov., a new species of Chaetothyrina
CHONTICHA SINGTRIPOP1,2,3, SINANG HONGSANAN1,2,3, JUNFU LI 1,2,3, NIMALI INDEEWARI DE SILVA1,2,3,
ALAN J.L. PHILLIPS5, E.B. GARETH JONES4, ALI H. BAHKALI4 & KEVIN D. HYDE1,2,3
1Key Laboratory of Biodiversity and Biogeography, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China
2World Agroforestry Centre, East and Central Asia, 132 Lanhei Road, Kunming 650201, China
3Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai 57100, Thailand
4Botany and Microbiology Department, College of Science, King Saud University, Riyadh 11442, Saudi Arabia
5Centro de Recursos Microbiológicos, Departamento de Ciências da Vida, Faculdade de Ciências e Tecnologia, Universidade Nova de
Lisboa, 2829-516, Caparica Lisbon, Portugal
Correspondence to*: kdhyde3@gmail.com
Abstract
Chaetothyrina musarum and C. mangiferae sp. nov. (Micropeltidaceae, Dothideomycetes) are reported from fruits of Musa
sp. (Musa acuminata × Musa balbisiana) and Mangifera indica, respectively. Introduction of a new species, Chaetothyrina
mangiferae, and provision of a reference specimen for C. musarum with sequence data, supported by morphology will help
to stabilize the taxonomy of the genus and family. Maximum likelihood and Bayesian analyses of LSU and SSU sequence
data show that C. musarum forms a distinct clade with other genera in Micropeltidaceae within Capnodiales and C. man-
giferae clusters in a poorly supported clade in Dothideomycetes, Illustrated accounts of Chaetothyrina musarum (reference
specimen) and C. mangiferae are provided and compared with similar taxa. This is the first report of C. musarum causing
sooty blotch and flyspeck disease on Musa sp. (Musaceae) in Thailand and C. mangiferae causing sooty blotch and flyspeck
disease of Mangifera indica (Anacardiaceae) worldwide.
Key words: Dothideomycetes, Mangifera indica, Micropeltidaceae, Microthyriales, Musa, new species
Introduction
The order Microthyriales was introduced by Arnaud (1918). This order presently comprises two families,
Micropeltidaceae and Microthyriaceae. The order Microthyriales has been poorly studied and there are few representative
cultures in culture collections and sequence data in GenBank is minimal. This order comprises saprobes, pathogens
and epiphytes found on dead or living leaves or stems (Kirk et al. 2008, Schoch et al. 2009, Wu et al. 2010, 2011a, b,
Hongsanan et al. 2014, 2015). Species of Microthyriales are characterized by small and inconspicuous black spots on
host tissues, which are the flattened, usually poorly developed at the base, ostiolate thyriothecia. Asci are bitunicate
with fissitunicate dehiscence and pseudoparaphyses may be present or lacking. Ascospores are hyaline to brown and
uni- to multi-septate (Arnaud 1918, von Arx & Müller 1975, Barr 1987, Kirk et al. 2008, Wu et al. 2011, Hyde et al.
2013, Hongsanan et al. 2014, 2015).
The family Micropeltidaceae was introduced by Clements & Shear (1931). The number of accepted genera has
varied from eight (von Arx & Müller 1975) to 27 (Kirk et al. 2008). Barr (1987) accepted five genera, Lumbsch &
Huhndorf (2010) accepted 24 genera, Hyde et al. (2013) included ten genera and Wijayawardene et al. (2014) included
13 genera. This family is distinguished by superficial, flattened and scutate thyriothecia, with an upper wall comprising
non-radiate, often meandrous interwoven cells, and a poorly developed base. The hamathecium comprises narrow
cellular pseudoparaphyses. Asci are bitunicate, and clavate to cylindrical and ascospores are hyaline with long-clavate
ascospores and usually with more than two septa (Clements & Shear 1931, Batista 1959, von Arx & Müller 1975, Barr
1987, Wu et al. 2011a, Hyde et al. 2013, Hongsanan et al. 2014). The family has been poorly studied (Wu et al. 2011,
Hyde et al. 2013, Hongsanan et al. 2014, 2015).
The genus
Chaetothyrina was introduced by Theissen (1913) and is typified by Chaetothyrina musarum (Speg.)
Theiss. Chaetothyrina is characterized by ascomata with setae, superficial hyphae which are absent or inconspicuous
SINGTRIPOP ET AL.
22 • Phytotaxa 255 (1) © 2016 Magnolia Press
and hyaline, 1-septate ascospores (Reynolds & Gilbert 2005, Hyde et al. 2013). This genus consists of 18 species
records in MycoBank and 17 species records in Index Fungorum (2015). The genus Chaetothyrina causes flyspeck
disease, e.g., C. musarum is found on banana (Musa sp.) (Muller & von Arx 1962) and C. panamensis on Oncoba
laurina (Muller & von Arx 1962, Hofmann & Piepenbring 2006).
Sooty blotch flyspeck disease (SBFS) is a disease complex caused by a diverse array of epiphytic fungi that
colonize the epicuticular wax layer of fruits, stems and leaves of many plants in humid areas, worldwide (Batzer et al.
2005, 2010, Yang et al. 2010, Cooley et al. 2011, Gleason et al. 2011, Miñarro et al. 2012, Hao et al. 2013, Mayfield et
al. 2013, Zhang et al. 2015). The causal fungi are characterized by colonies produced on host tissues, from superficial,
spreading, dark, irregular blotches of mycelium, with or without sclerotium-like structures or fruiting bodies and
are referred to as “sooty blotch”. “Flyspeck” on the other hand designates clusters of shiny, small black sclerotium-
like structures or fruiting bodies, lacking visible intercalary mycelium (Batzer et al. 2005, Frank et al. 2010, Yang
et al. 2010, Gleason et al. 2011, Mayfield et al. 2013). A typical example of flyspeck is on apple and is caused by
Schizothyrium pomi (Mont. & Fr.) Arx (Farr 1961, Batzer et al. 2002, Gleason et al. 2011). Infected fruits are generally
rejected by the market and consumers, resulting in considerable economic loss to growers (Batzer et al. 2010, Miñarro
et al. 2012, Zhang et al. 2015). The SBFS complex is estimated to comprise 60–80 species (Batzer et al. 2005, Gleason
et al. 2011, Díaz Arias et al. 2010), most are either taxonomically undetermined or undescribed (Batzer et al. 2008, Sun
et al. 2008, Schoch et al. 2009, Yang et al. 2010).
The aim of this paper is to introduce and describe a new species, Chaetothyrina mangiferae and provide a reference
specimen for C. musarum with molecular data. Both species cause sooty blotch and flyspeck disease; C. musarum on
fruits of Musa sp. and C. mangiferae on fruits of Mangifera indica in northern Thailand. The type material of C.
musarum is also illustrated along with the reference specimen. Chaetothyrina mangiferae is introduced based on
morphological and phylogenetic evidence.
Material and methods
Sample collection and morphological studies
Fruits of Musa sp. (M. acuminata × M. balbisiana) and Mangifera indica were collected in Chiang Rai Province,
Thailand and brought to the laboratory in paper bags where they were examined using a Motic SMZ 168 series dissecting
stereo-microscope. Free-hand sections of ascomata were mounted in 10% lactoglycerol for photomicrography and
microscopic studies. The taxa were examined using a Nikon ECLIPSE 80i compound microscope and photographed
by a Canon 550D and 600D digital camera fitted to the microscope. Tarosoft (R) Image Frame Work program was
used for measuring, and images used for figures were made with Adobe Photoshop CS5 Extended version 12.0
software (Adobe Systems, USA). Isolation was carried out from single ascospores following the method described by
Chomnunti et al. (2014) and germinating single spores were transferred directly to malt extract agar (MEA) plates and
grown at 15–18°C. Characters of colonies were observed and measured after 1–2 weeks.
The type materials are deposited in the herbarium of Mae Fah Luang University (MFLU), Chiang Rai, Thailand
and Kunming Herbarium Collection (KUN), Kunming, China. Cultures are deposited at the Mae Fah Luang University
Culture Collection (MFLUCC), Chiang Rai, Thailand and Mycothèque de l’Université Catholique de Louvain (MULC),
Belgium. Faces of Fungi and Index Fungorum numbers were obtained as explained in Jayasiri et al. (2015) and Index
Fungorum (2015).
DNA extraction and PCR reaction
Genomic DNA was extracted from mycelium grown on MEA for 1–2 weeks at 25–28°C using a Biospin Fungus
Genomic DNA Extraction Kit (BioFlux®) following the manufacturers’ protocol. The amplification of rDNA regions
of the small subunit rDNA (SSU) and large subunit (LSU) was carried out using NS1 and NS4 (White et al. 1990)
and LROR and LR5 (Vilgalys & Hester 1990). The amplification procedure was performed in a 25 l reaction volume
containing 1 l DNA, 1 l of primer 1 and primer 2, 12.5 l of 2xMaster Mix and 9.5 l of ddH2O. Amplification
conditions were setup for initial denaturation of 3 min at 94°C, followed by 35 cycles of 30 s at 94°C, 50 s at 55°C
and 1 min at 72°C, and a final extension period of 10 min at 72°C. The PCR products were checked on 1% agarose
electrophoresis gels stained with ethidium bromide. Purification and sequencing of PCR products were done by
Shangkai Majorbio Biopharm Technology Co., China.
A NEW SPECIES OF CHAETOTHYRINA Phytotaxa 255 (1) © 2016 Magnolia Press • 23
Sequence alignment and phylogenetic analyses
The two generated sequences were compared with other sequences in GenBank by nucleotide megablast searches.
Multiple sequence alignment was carried out in BioEdit (Hall 1999) and Clustal X (Thompson et al. 1997). Maximum
likelihood analysis was performed by using raxmlGUIv.0.9b2 (Silvestro & Michalak 2012). The search strategy was
set to rapid bootstrapping and the analysis carried out using the GTRGAMMAI model of nucleotide substitution. The
number of replicates was inferred using the stopping criterion (Pattengale et al. 2009). Maximum likelihood (ML)
bootstrap values equal or greater than 60% are given above the nodes (Fig. 1). The model of evolution was carried
out using MrModeltest 2.2 (Nylander et al. 2008). Posterior probabilities (PP) (Rannala & Yang 1996, Zhaxybayeva
& Gogarten 2002) were determined by Markov Chain Monte Carlo sampling (BMCMC) using MrBayes v3.1.2
(Huelsenbeck & Ronquist 2001). Bayesian posterior probabilities (BYPP) equal or greater than 0.90 are given below
the nodes (Fig. 1). A single species of Arthoniomycetes, the sister class to Dothideomycetes, Schismatomma decolorans
(Turner & Borrer ex Sm.) Clauzade & Vzda (DUKE 0047570) was chosen as the out group taxon (Wu et al. 2011,
2014, Hongsanan et al. 2014).
Results
DNA sequencing—SSU and LSU
The combined gene analysis of the LSU and SSU dataset comprised 53 taxa including our new strains of Chaetothyrina
musarum and C. mangiferae sp. nov. Sequence data from taxa in Capnodiaceae, Dissoconiaceae, Micropeltidaceae,
Microthyriaceae, Mycosphaerellaceae, Natipusillaceae, Phaeotrichaceae, Schizothyriaceae, Symphoventuriaceae,
Venturiaceae and Zeloasperisporiaceae were downloaded from GenBank to supplement the dataset (Table 1).
Phylogenetic analyses used combined LSU and SSU sequence data (Fig. 1). The Micropeltidaceae I clade comprises
six available strains from GenBank and formed within Capnodiales (68% ML, 0.9 PP support). Chaetothyrina
musarum groups with strains of Stomiopeltis and Houjia in the clade Micropeltidaceae I, but is separated from other
strains with relatively strong bootstrap support (90% ML, 0.95 PP support, Fig. 1) and forms a robust clade sister to
Stomiopeltis versicolor (Desm.) Arx (GA3 23C2b). The Micropeltidaceae II clade comprises five available strains
from GenBank, and three of the five strains belong to Micropeltis which is the generic type of Micropeltidaceae.
The Micropeltidaceae II clade is clustered as a sister group to the Microthyriaceae clade. Chaetothyrina mangiferae
clusters with Paramicrothyrium chinensis H.X. Wu & K.D. Hyde (IFRDCC 2258) with high support (100% ML, 1.0
PP support, Fig. 1). However, Chaetothyrina mangiferae is not morphologically similar to Paramicrothyrium chinensis
(IFRDCC 2258) but similar to Chaetothyrina musarum, thus introduced as a new species. Although support for the
different genera of Micropeltidaceae is generally weak, we suspect this is because the family is poorly populated with
sequence data and some genus / species names are putative (e.g., Stomiopeltis versicolor).
Phylogeny
TABLE 1. Taxa used in the phylogenetic analysis and their corresponding GenBank accession numbers. All ex-type sequences are
indicated in bold, the new sequences are in red bold and reference specimen in blue bold.
Species Culture Accession No. GenBank Accession No.
LSU SSU
Apiosporina collinsii CBS 118973 GU301798 GU296135
Capnodium coartatum MFLUCC10-0069 JN832614 JN832599
Capnodium coffeae CBS 147.52 GU214400 DQ247808
Chaetothyrina mangiferae MFLUCC14-0201 KU710172 KU710173
Chaetothyrina musarum MFLUCC15-0383 KU710171 KU710174
Chaetothyriothecium elegans CPC 21375 KF268420 -
Dissoconium aciculare CBS 204.89 GU214419 GU214523
Dothistroma septosporum CBS:112498 GQ852597 JX901744
...Continued on next page
SINGTRIPOP ET AL.
24 • Phytotaxa 255 (1) © 2016 Magnolia Press
TABLE 1. (Continued)
Species Culture Accession No. GenBank Accession No.
LSU SSU
Fusarium ramoconidii CBS 463.82 EU035439 -
Fusicladium pini CBS 462.82 EU035436 -
Houjia yanglingensis YHLB20 GQ433630 -
Houjia yanglingensis YHJN13 GQ433631 -
Leptoxyphium cacuminum MFLUCC10-0049 JN832602 JN832587
Leptoxyphium kurandae CPC:17274 KF982311 KF982312
Micropeltis dendrophthoes MFLUCC15-0599 KT588595 KT588597
Micropeltis dendrophthoes MFLUCC15-0600 KT588596 KT588598
Micropeltis zingiberacicola IFRDCC 2264 JQ036227 JQ036222
Microthyrium buxicola MFLUCC15-0212 KT306551 KT306549
Microthyrium buxicola MFLUCC15-0213 KT306552 KT306550
Microthyrium microscopicum CBS 115976 GU301846 GU296175
Mycosphaerella ellipsoidea CBS:110843 GQ852602 AY725545
Mycosphaerella keniensis CBS:111001 GQ852610 -
Mycosphaerella marksii CBS:110942 GQ852612 -
Mycosphaerella punctiformis CBS 113265 NG_027571 AY490775
Natipusilla decorospora L-A236-1A HM196369 HM196376
Natipusilla limonensis L-AF286-1A HM196370 HM196377
Natipusilla naponensis L-AF217-1A HM196371 HM196378
Paramicrothyrium chinensis IFRDCC 2258 JQ036229 JQ036224
Phaeothecoidiella illinoisensis CBS:125223 GU117901 -
Phaeothecoidiella missouriensis CBS:118959 GU117903 -
Phaeotrichum benjaminii CBS 541.72 GU357788 AY538349
Phloeospora maculans CBS 115123 GU214670 GU214670
Phragmocapnias betle MFLUCC10-0053 JN832606 JN832591
Pseudoveronaea ellipsoidea MI3 34F1a JQ622103 -
Ramichloridium apiculatum CBS 400.76 EU041851 EU041794
Schizothyrium pomi CUA1a AY598895 -
Schizothyrium pomi Flyspeck1924-Zj001 AY598894 -
Schizothyrium pomi VA1_7A1d FJ147155 -
Stomiopeltis betulae CBS 114420 GU214701 GU214701
Stomiopeltis versicolor GA3 23C2b FJ147163 -
Sympoventuria capensis CPC 120136 KF156104 KF156094
Trichodelitschia bisporula CBS 262.69 GU348996 GU296202
Trichodelitschia munkii Kruys 201 (UPS) DQ384096 -
Trypethelium eluteriae 111 GU327726 GU327704
Tumidispora shoreae MFLUCC 12-0409 KT314073 KT314075
...Continued on next page
A NEW SPECIES OF CHAETOTHYRINA Phytotaxa 255 (1) © 2016 Magnolia Press • 25
TABLE 1. (Continued)
Species Culture Accession No. GenBank Accession No.
LSU SSU
Tumidispora shoreae MFLUCC 14-0574 KT314074 KT314076
Venturia inaequalis CBS 594.70 GU301879 KF156093
Zeloasperisporium eucalyptorum CBS:14603 GQ303329 -
Zeloasperisporium hyphopodioides CBS218.95 EU035442 -
Zeloasperisporium siamense IFRDCC 2194 JQ036227 JQ036223
Zeloasperisporium wrightiae MFLUCC15-0225 KT387737 KT387738
Zygophiala cryptogama KY1_1.2A1c EF164902 -
Zygophiala wisconsinensis MSTA8a AY598897 -
Taxonomy
The present study resulted in the discovery of a new species, Chaetothyrina mangiferae, and a reference specimen of
C. musarum is provided. These species were associated with SBFS on mango (Mangifera indica) and banana (Musa
acuminata × Musa balbisiana), respectively. The genus and species are treated below.
Chaetothyrina Theiss., Annls mycol. 11(6): 495 (1913)
Epiphytic on stems, leaves or fruit surfaces, as very small, black, shiny dots, with long setae. Sexual morph: Thyriothecium superficial,
easily removed from host, circular, brown to dark brown, rounded and darkened at the margin, base poorly developed, with long
setae, lacking superficial mycelium. Setae straight, rounded at the apex, unbranched, with dark septa, brown to dark brown. Upper
wall comprising brown to dark brown cells of textura epidermoidea. Hamathecium comprising septate, hyaline, pseudoparaphyses.
Asci 8-spored, bitunicate, broadly obovoid to pyriform, apically rounded, with an ocular chamber, smooth-walled. Ascospores 2–3-
seriate, broadly ellipsoidal to fusoid, 1-septate, slightly constricted at the septum, hyaline, smooth-walled, upper cell mostly larger
than lower cell, base with rounded ends.
Type species:—Chaetothyrina musarum (Speg.) Theiss.
Notes:—Chaetothyrina was introduced by Theissen (1913) as a monotypic genus and typified by Chaetothyrina
musarum. (Speg.) Theiss. Müller & von Arx (1962) provided an illustrated account. The genus is characterized by
ascomata with setae, lack of superficial hyphae and hyaline, 1-septate ascospores (Reynolds & Gilbert 2005, Hyde et
al. 2013).
Chaetothyrina musarum (Speg.) Theiss., Annls mycol. 11(6): 495 (1913)
Chaetothyrium musarum Speg., Anales del Museo Nacional de Historia Natural Buenos Aires 6: 297 (1898).
Description from BPI 646466 (Fig 2.)
Epiphytic on the surface of fruit of Musa sapientum L. Sexual morph: Thyriothecia 110–155 × 105–150 m (
x
= 134 ×
123 m, n = 5), superficial on host tissues, solitary, circular, brown to dark brown, rounded and darkened at the margin,
easily removed, base poorly developed, with setae, ostiole central, lacking superficial mycelium. Setae 90120 m
long, arising from the surface of thyriothecia, straight, rounded at the apex, unbranched, septate, darkened at the septa,
brown to dark brown. Upper wall comprising 23 layers of textura epidermoidea, brown to dark brown. Hamathecium
comprising septate, hyaline, pseudoparaphyses. Asci 24–38 × 10–14 m (
x
= 32 × 12 m, n = 8), 8-spored, bitunicate,
broadly obovoid to pyriform, apex apically rounded, with an ocular chamber, smooth-walled. Ascospores 10–13 × 3–4
m (
x
= 12 × 4 m, n = 20), 2–3-seriate, hyaline, broadly ellipsoidal to fusoid, 1-septate, slightly constricted at the
septum, upper cell mostly larger than lower cell, basal cell with rounded ends, smooth-walled.
SINGTRIPOP ET AL.
26 • Phytotaxa 255 (1) © 2016 Magnolia Press
FIGURE 1. RAxML maximum likelihood tree obtained from a representative dataset of 53 taxa (LSU and SSU sequence data) of
Capnodiaceae, Dissoconiaceae, Micropeltidaceae, Microthyriaceae, Mycosphaerellaceae, Natipusillaceae, Phaeotrichaceae,
Schizothyriaceae, Symphoventuriaceae, Venturiaceae and Zeloasperisporiaceae and rooted with Trypethelium eluteriae as the out group
taxon. Bootstrap support values greater than 50% for maximum likelihood (ML), expressed from 1,000 repetitions, are shown above
the nodes. The values below the nodes are Bayesian posterior probabilities above 0.90. The new species is in red bold and the reference
specimen in blue bold. All other type strains are in black bold and the original isolate numbers are noted after the species names.
Material examined:—BRAZIL. Districto Federal: on fruit of Musa sapientum L., 30 December 1931, H. Grillo
(BPI 646466).
Notes:—Chaetothyrina musarum was introduced by Theissen (1913) as a monotypic genus, and Chaetothyrium
musarum Speg. (1899) and Plochmopeltidella smilasina Mendoza (1925) are synonyms. The fungus is reported from
Musa sp., Musa paradisiaca L. (Musaceae), Smilax spp. (Liliaceae) and other plants in tropical America, Africa and
South Asia (Müller & von Arx 1962).
Description from reference collection (Fig. 3)
Faceoffungi Number: FoF02009
Epiphytic associated with sooty blotch and flyspeck complex disease on the surface of fruit of Musa sp., appearing
as very small, black, shiny dots, rounded to ovoid, with setae. Sexual morph: Thyriothecia 125–160 × 125–150 m
(
x
= 140 × 138 m, n = 5), superficial or partly immersed in host tissues, solitary, circular, brown to dark brown,
rounded and darkened at the margin, easily removed, base poorly developed, with long setae, ostiole central, lacking
A NEW SPECIES OF CHAETOTHYRINA Phytotaxa 255 (1) © 2016 Magnolia Press • 27
superficial mycelium. Setae 105135m long, arising from the surface of thyriothecium, straight, rounded at the apex,
unbranched, septate, darkened at the septa, brown to dark brown, smooth-walled. Upper wall comprising 23 layers
of brown to dark brown cells of textura epidermoidea. Hamathecium comprising 11.8 m wide, septate, hyaline
pseudoparaphyses. Asci 30–41 × 10–13 m (
x
= 35 × 12 m, n = 10), 8-spored, bitunicate, broadly obovoid to
pyriform, apically rounded, with an ocular chamber. Ascospores 11–14 × 4–5 m (
x
= 12 × 4 m, n = 20), 2–3-seriate,
hyaline, broadly ellipsoidal to fusoid, somewhat curved, 1-septate, slightly constricted at the septum, smooth-walled,
upper cell mostly larger than lower cell, base with rounded end. Asexual morph: Undetermined.
FIGURE 2. Chaetothyrina musarum (BPI 646466). A. Specimen label. B. Herbarium specimens. C. Appearance of thyriothecia on host.
D. Thyriothecia when viewed in squash mount. E. Section through thyriothecium. F. Seta arising from the surface of thyriothecium. G.
Upper wall of thyriothecium when viewed in squash mount. h, i. Immature asci. j, k. Ascospores. Scale bars: d=50 m, e=100 m, fi=10
m, j, k=5 m.
Culture characters:—Ascospores germinating on MEA at 25–28oC after 24–36 hours, germ tubes appearing from
each end of the ascospore, colonies reaching 1.8–2 cm diam. after 15 days on MEA at 25–28oC, raised, comprising
raised, dark grey mycelium, white to greyish at the margin, surface of colonies velvety.
SINGTRIPOP ET AL.
28 • Phytotaxa 255 (1) © 2016 Magnolia Press
FIGURE 3. Chaetothyrina musarum (MFLU16-0884) a. Disease symptom on fruit. b, c. Appearance of thyriothecia on host. d. Section
through thyriothecium. e. Thyriothecium when viewed in squash mount. f. Seta arising from the surface of thyriothecium. g. Upper wall of
thyriothecium when viewed in squash mount. h. Pseudoparaphyses. i. Immature ascus. j–l. Mature asci. m–p. Ascospores. q. Colonies on
MEA from above and below. Scale bars: b=500 m, c=200 m, d=50 m, e=100 m, f–l=20 m, m–p=10 m, q=2 cm.
Material examined:—THAILAND. Chiang Rai Province: Tar Sud District, on fruit of Musa sp. (M. acuminata
× M. balbisiana, Musaceae), 12 January 2014, Chonticha Singtripop, FS02, (MFLU16-0884, HKAS90976, reference
specimen designated here); Chiang Rai Province: Tar Sud District, on fruit of Musa sp. (M. acuminata × M. balbisiana)
22 February 2015, Chonticha Singtripop, (MFLU16-0885), living culture, MFLUCC 15-0383, MUCL55904.
A NEW SPECIES OF CHAETOTHYRINA Phytotaxa 255 (1) © 2016 Magnolia Press • 29
FIGURE 4. Chaetothyrina mangiferae (holotype). a, b. Disease symptoms on fruit. c. Appearance of thyriothecium on host. d.
Thyriothecium when viewed in squash mount. e. Seta arising from the surface of thyriothecium. f. Upper wall of thyriothecium when
viewed in squash mount. g. Section of thyriothecium. h. Pseudoparaphyses. i, j. Asci. k. Ascus in Melzer’s reagent. l, m. Ascospores. n, o.
Ascospores germinating in Melzer’s reagent. p. Colonies on MEA plate viewed from above. Scale bars: b=1,000 m, c=200 m, d=100
m, f, g=50 m, e, h, k=20 m, lo=10 m, p=2 cm.
Chaetothyrina mangiferae Singtripop, Hongsanan & K.D. Hyde, sp. nov.
Facesoffungi number: FoF02010 (Fig. 4)
Etymology:—mangiferae refers to host, Mangifera indica
Holotype:—MFLU 14-0191.
Epiphytes associated with the sooty blotch and flyspeck complex disease of fruit of Mangifera indica, appearing
as very small, black, shiny dots, round to ovoid, with long setae. Sexual morph: Thyriothecium 90–130 × 80–120 m (
x
=110 × 104 m, n=5), superficial or partly immersed in host tissues, solitary, circular, brown to dark brown, rounded
and darkened at the margin, easily removed, base poorly developed, with setae, ostiole central, lacking superficial
SINGTRIPOP ET AL.
30 • Phytotaxa 255 (1) © 2016 Magnolia Press
mycelium. Setae 50120 m long, arising from the surface of thyriothecium, straight, rounded at the apex, unbranched,
septate, darkened at the septa, brown to dark brown, smooth-walled. Upper wall comprising 23 layers of brown to
dark brown cells of textura epidermoidea. Hamathecium of 35 m wide, septate, hyaline pseudoparaphyses. Asci
26–36 × 11–12 m (
x
=32 × 12 m, n=5), 8-spored, bitunicate, broadly oblong to pyriform, ends apically rounded,
with an ocular chamber. Ascospores 11–23 × 3–6 m (
x
=16 × 5 m, n=10), 2–3-seriate, hyaline, broadly ellipsoidal
to fusoid, 1-septate, slightly constricted at the septa, upper cell mostly larger than lower cell, rounded ends, smooth-
walled. Asexual morph: Undetermined.
Culture characters:—Ascospores germinating on MEA at 25–28oC after 24–36 hours in the dark, germ tubes
appearing from each end of the ascospores. Colonies reaching 0.8–1 cm diam. after 15 days on MEA at 25–28oC,
raised, comprising raised dark grey mycelium, white to greyish at the margin.
Material examined:—THAILAND. Chiang Rai Province: Tar Sud District, on living fruit of Mangifera indica
(Anacardiaceae), 7 December 2013, Chonticha Singtripop FS01 (MFLU 14-0191, holotype, HKAS 90977, isotype);
Tar Sud District, on living fruit of M. indica, 18 January 2015, Chonticha Singtripop (MFLU16-0886), ex-type living
culture, MFLUCC 14-0201, MUCL55902.
Notes:—Chaetothyrina mangiferae is most similar to C. applanata (Ellis & G. Martin) M.E. Barr, in having
superficial scutate thyriothecia with dark brown, septate setae, an upper wall comprising cells of textura epidermoidea,
bitunicate, oblong to pyriform asci and 1-septate, hyaline ascospores (Barr 1993), However, it differs in having smaller
thyriothecia, larger, ellipsoidal to fusoid ascospores and a different host.
Discussion
The present study treats a new species, Chaetothyrina mangiferae and provides a reference specimen (sensu Ariywansa
et al. 2014) for C. musarum with molecular data. The species were associated with SBFS of mango (Mangifera indica)
and banana (Musa acuminata × M. balbisiana), respectively, and were collected in northern Thailand. Although C.
musarum and C. mangiferae are morphologically similar, they have differences in several base pairs in SSU and LSU
sequence data. Ismali et al. (2016) showed the placement of Micropeltidaceae in Capnodiales in their phylogenetic
tree; however, they did not include the strains of Micropeltis, which is the type genus of this family. This study uses
LSU and SSU sequence data to show the placement of Micropeltidaceae species in two separate clades (Fig. 1).
The first group clustered as a distinct clade in Capnodiales (similar to Ismail et al. 2016), and the other clustered
as family incertae sedis in Dothideomycetes. More collections and sequence data are needed to clarify and provide
a reasonable placement of Micropeltidaceae in the phylogenetic tree. Chaetothyrina musarum clustered with other
species of Micropeltidaceae within Capnodiales, while C. mangiferae is a distinct species in the clade that comprises
three strains of Micropeltis, but outside Capnodiales (Fig. 1). These results probably reflect the fact that the trees are
poorly populated with taxa from Micropeltidaceae.
Based on the morphological study Chaetothyrina mangiferae (MFLUCC 14-0201) is introduced as a new species
even though the phylogenetic tree shows it groups with Paramicrothyrium chinensis (100% ML, 1.0 PP support,
Fig. 1). The phylogenetic tree branch length of Chaetothyrina mangiferae is longer than Paramicrothyrium chinensis
(IFRDCC 2258). Chaetothyrina musarum and C. mangiferae are often found on post-harvest fruits in markets in
Thailand during the cold season (November to February).
Acknowledgements
This work was supported by the International Research Group Program (IRG-14-27), Deanship of Scientific Research,
King Saud University, Saudi Arabia. We would like to thank Mae Fah Luang University grant “Taxonomy and
Phylogeny of selected families of Dothideomycetes (Grant number: 56101020032)” for supporting this study. Thanks
to Humidtropics, a CGIAR Research Program that aims to develop new opportunities for improved livelihoods in a
sustainable environment, for partially funding this work, Chinese Academy of Sciences, project number 2013T2S0030,
for the award of Visiting Professorship for Senior International Scientists at Kunming Institute of Botany, Plant
Germplasm and Genomics Center in Germplasm Bank of Wild Species, Kunming Institute of Botany for the help with
molecular work. Chonticha Singtripop thanks Saranyaphat Boonmee, Mingkhuan Doilom, Ausana Mapook, Sirinapa
Konta and Chada Norphanphoun for their valuable suggestions and help.
A NEW SPECIES OF CHAETOTHYRINA Phytotaxa 255 (1) © 2016 Magnolia Press • 31
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