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Nomenclatural notes on some cercosporoid hyphomycetes
Uwe Braun, David F. Farr & Andrew M. Minnis
Abstract: Braun, U., Farr, D.F. & Minnis, A.M. 2009: Nomenclatural notes on some cercosporoid
hyphomycetes. Schlechtendalia 19: 81– 84.
Cercospora haleniae is validated, Cercospora tragiicola sp. nov. and Passalora halesiicola sp. nov. (≡
Cercospora halesiae nom. inval., Passalora halesiae comb. inval.) are described and the combination
Pseudocercospora nepheloides is introduced.
Zusammenfassung: Braun, U., Farr, D.F. & Minnis, A.M. 2009: Nomenklatorische Anmerkungen
zu einigen cercosporoiden Hyphomyzeten. Schlechtendalia 19: 81– 84.
Cercospora haleniae wird validiert, Cercospora tragiicola sp. nov. und Passalora halesiicola sp. nov.
(≡ Cercospora halesiae nom. inval., Passalora halesiae comb. inval.) werden beschrieben und die
Kombination Pseudocercospora nepheloides wird eingeführt.
Key words: Cercospora, combinations, nomenclature, Passalora, validations.
Crous & Braun (2003) published an annotated list of names published in Cercospora
Fresen. and Passalora Fr. (Mycosphaerella Johanson anamorphs). The nomenclature
of several names has recently been checked. The following names and combinations
proved to be invalid or otherwise in need of correction.
1. Cercospora haleniae Chupp & Bisby ex U. Braun, D.F. Farr & Minnis, sp. nov.
MycoBank, MB 513134
≡ Cercospora haleniae Chupp & Bisby, Fungi of Manitoba and Saskatchewan: 114,
1938, nom. inval. (ICBN, Art. 36.1; McNeill et al. 2006).
Differt a C. apii s. lat. conidiophoris brevioribus, 5 –30 × 3 – 6 µm, cicatricibus conidi-
alibus 1–1.5 µm diam. et conidiis obclavatis-subcylindraceis.
Holotype: On Halenia deflexa (Gentianaceae), Canada, Manitoba, Berens River, 1
Aug. 1935, G.R. Bisby 4921 (CUP 39964).
Leaf spots amphigenous, subcircular, brown, margin indefinite. Caespituli amphigenous,
punctiform, dark brown to blackish. Mycelium internal. Stromata intraepidermal,
10 –25 µm diam., yellowish brown to brown. Conidiophores in small to moderately
large fascicles, arising from stromata, erumpent, subcylindrical-conical to geniculate-
sinuous, unbranched, 5 –30 × 3 – 6 µm, 0 –1-septate, pale to medium olivaceous-brown,
thin-walled, smooth. Conidiophores reduced to conidiogenous cells or conidiogenous
cells integrated, terminal, 5 –20 µm long. Conidiogenous loci conspicuous, thickened
and darkened, 1–1.5 µm diam. Conidia solitary, obclavate-cylindrical, 20 –70(– 80) ×
3 – 6 µm, 1– 6-septate, hyaline or subhyline, thin-walled, smooth, apex obtuse to sub-
82 Schlechtendalia 19 (2009)
acute, base obconically truncate, 1.5 –2 µm wide, hilum somewhat thickened and dark-
ened.
Notes: Crous & Braun (2003) re-examined type material of C. haleniae and maintained it as a
morphologically well-characterized species of Cercospora s. str. that is easily distinguished from
the C. apii Fresen. complex by its uniformly short conidiophores with smaller conidiogenous loci
and obclavate-cylindrical conidia. Unfortunately, C. haleniae has to be considered an invalid species
since a Latin description or diagnosis was lacking in the original publication. This species was also
described by Chupp (1954) in his monograph, but only in English.
2. Cercospora tragiicola U. Braun, D.F. Farr & Minnis, sp. nov. MycoBank, MB
513135
≡ Cercospora euphorbiicola var. tragiae Tharp (‘euphorbiaecola’), Mycologia 9:
109, 1917.
≡ Cercospora euphorbiicola-tragiae Tharp, auct. (erroneous citation).
= Cercospora tragiae Ellis & Everh., in herb.
Differt a Cercospora tragiae-folii conidiophoris brevioribus, 5 –25 × 2–5 µm, non sep-
tatis, cicatricibus conidialibus 1–1.5 µm diam. et conidiis 1.5 –3 µm latis.
Holotype: On Tragia nepetifolia (Euphorbiaceae), USA, Texas, Austin, 6 Oct. 1914,
I.M. Lewis & B.C. Tharp (BPI 436234).
Leaf spots subcircular to irregular, 1– 8 mm diam., center pale, yellowish to och-
raceous-brown, margin narrow, dark brown. Caespituli amphigenous, punctiform to
confluent, dull brown. Mycelium internal. Stromata 20 –35 µm diam., globose, brown.
Conidiophores in small to moderately large, dense fascicles, arising from stromata,
erect, straight, subcylindrical-conical to slightly geniculate-sinuous, unbranched, 5 –25
× 2–5 µm, aseptate (conidiophores reduced to conidiogenous cells), pale yellowish
brown, tips often paler, thin-walled, smooth. Conidiogenous loci conspicuous, slightly
thickened and darkened, 1–1.5 µm diam. Conidia solitary, narrowly obclavate-cylindri-
cal to acicular, (20 –)30 – 80(–110) × 2–3.5 µm, apex subacute, base slightly to distinctly
obconically truncate, 1–1.5 µm wide, hilum slightly thickened and darkened.
Notes: The nomenclature of this species is confusing. Chupp (1954) cited this species as
“Cercospora euphorbiaecola tragiae” and discussed its taxonomy. He emphasized that this fun-
gus “is not at all like C. euphorbiaecola” and “could well be changed to C. tragiae.” However,
he did not formally introduce and recognize this combination. Crous & Braun (2003) consid-
ered this fungus a separate species of Cercospora s. str. that is easily distinguished from the C.
apii complex by having uniformly short, aseptate conidiophores with small conidiogenous loci,
only 1–1.5 µm diam., and obclavate-cylindrical conidia. However, they followed Chupp (1954)
and listed this species under the name “C. euphorbiicola-tragiae.” Cercospora euphorbiicola
G.F. Atk. (≡ Pseudocercospora euphorbiicola (G.F. Atk.) U. Braun & Crous) is an unrelated
species which was reallocated to Pseudocercospora Speg. in Crous & Braun (2003). The
variant “C. euphorbiicola-tragiae” (as species name) is, however, incorrect. This name was
definitely only published as a variety, viz. Cercospora euphorbiicola var. tragiae. This fungus
does not have a valid name at the species rank. In order to avoid further confusion, we prefer
to describe a new species using another epithet. C. tragiae-folii A.K. Kar & M. Mandal, de-
scribed from India (Kar & Mandal 1973), is another true Cercospora species on Tragia. It
differs from C. tragiicola in having much longer and wider conidiophores, up to about 280 ×
3 –5 µm, wider conidiogenous loci, 2.5 – 4.5 µm, and wider conidia, 3 – 4.5 µm (holotype!: on
Braun et al.: Nomenclatural notes on some cercosporoid hyphomycetes 83Nomenclatural notes on some cercosporoid hyphomycetes 83 83
Tragia involucrata, India, West Bengal, Jalangi, Murshidabad, 27 Jan. 1967, A.K. Kar. & M.
Mandal, IMI 135155).
3. Passalora halesiicola U. Braun, D.F. Farr & Minnis, sp. nov. MycoBank, MB
513136
≡ Cercospora halesiae Dearn., Mycologia 33: 365, 1941, nom. inval. (ICBN, Art.
36.1; McNeill et al. 2006).
≡ Passalora halesiae (Dearn.) U. Braun & Crous, Mycosphaerella and its ana-
morphs: 1. Names published in Cercospora and Passalora. CBS Biodiversity
Series 1: 209, 2003, comb. inval.
Maculae irregulares, brunneae, 5 –20 mm diam., margine indistincto. Caespituli am-
phigeni, subeffusi, bruneoli. Mycelium internum et externum, hyphis superficialibus
vix ramosis, subhyalinis, pallide olivaceis vel olivaceo-brunneis, septatis, tenuituni-
catis, laevibus, 1–3.5 µm latis. Stromata nulla vel minuta, ad 30 µm diam., brunnea.
Conidiophora laxe fasciculata, 2–15, vel solitaria, ex hyphis superficialibus oriunda,
erecta, subcylindrica vel geniculata-sinuosa, non ramosa, 20 –110 × 4 –7 µm, 2– 6-sep-
tata, brunnea, tenuitunicata, laevia. Cellulae conidiogenae integratae, terminales et
intercalares, 10 –25 µm longae. Cicatrices conidiales conspicuae, incrassatae et fus-
catae, 1.5 –2.5 µm diam. Conidia solitaria, obclavata-subcylindrica, 20 – 80(–105) ×
3 –5.5 µm, 2–9-septata, pallide brunnea vel olivaceo-brunnea, tenuitunicata, laevia,
apice obtuso, basi obconice truncata, hilo leniter incrassato et fuscato.
Holotype: On Halesia carolina (= H. tetraptera) (Styracaceae), USA, Tenn., Blount
Co., Bote Mt., Great Smoky Mountains National Park, 18 Aug. 1937, C.W. Greene,
Dearness 8959 (DAOM).
Leaf spots variable in shape and size, irregular, brown, 5 –20 mm diam., margin indis-
tinct. Caespituli amphigenous, subeffuse, brownish. Mycelium internal and external;
superficial hyphae sparingly branched, subhyaline, pale olivaceous or olivaceous-
brown, septate, thin-walled, smooth, 1–3.5 µm wide. Stromata lacking or small, up to
30 µm diam., brown. Conidiophores in loose fascicles, 2–15, or solitary, arising from
superficial hyphae, erect, subcylindrical to geniculate-sinuous, unbranched, 20 –110 ×
4 –7 µm, 2– 6-septate, brown, thin-walled, smooth. Conidiogenous cells integrated, ter-
minal and intercalary, 10 –25 µm long. Conidiogenous loci conspicuous, thickened and
darkened, 1.5 –2.5 µm diam. Conidia solitary, obclavate-subcylindrical, 20 – 80 (–105)
× 3 –5.5 µm, 2–9-septate, pale brown or olivaceous-brown, thin-walled, smooth, apex
obtuse, base obconically truncate, hilum slightly thickened and darkened.
Notes: A description of Cercospora halesiae was given in Chupp (1954). Crous & Braun (2003)
examined type material of this species and assigned it to Passalora due to thickened, darkened coni-
diogenous loci and pigmented conidia. On account of the formation of superficial hyphae with solitary
conidiophores, this species is Mycovellosiella-like. Unfortunately, C. halesiae was published without
a Latin description, which renders this name and the combination Passalora halesiae invalid.
4. Pseudocercospora nepheloides (Ellis & Holw. ex Heald & F.A. Wolf) U. Braun,
D.F. Farr & Minnis, comb. nov. MycoBank, MB 513137
Bas.: Cercospora nepheloides Ellis & Holw. ex Heald & F.A. Wolf, U.S.D.A. Bur. Pl.
Industr. Bull. 226: 87, 1912 (Jan.).
84 Schlechtendalia 19 (2009)
= Cercospora eustomatis Peck (‘eustomae’), Bull. New York State Mus. Nat. Hist.
157: 45, 1912 (Mar.).
≡ Cercosporina eustomatis (Peck) Sacc. (‘eustomae’), Syll. fung. 25: 903, 1931.
≡ Pseudocercospora eustomatis (Peck) U. Braun, Schlechtendalia 2: 15, 1999.
Notes: Braun (1999) examined type material of C. eustomatis, reallocated this species to
Pseudocercospora and published a description and illustration. C. nepheloides was reduced to syn-
onymy with P. eustomatis (Braun 1999). The two names were published in 1912, but C. nepheloides,
published in January, proved to have priority. In its protologue, the name, but not the validating de-
scription, was attributed to Ellis & Holw.
References
Braun, U. 1999: Taxonomic notes on some species of the Cercospora complex (V). Schlechtendalia
2: 1–28.
Chupp, C. 1954: A monograph of the fungus genus Cercospora. Published by the author, Ithaca.
Crous, P.W. & Braun, U. 2003: Mycosphaerella and its anamorphs: 1. Names published in
Cercospora and Passalora. CBS Biodiversity Series 1: 1–571.
Kar, A.K. & Mandal, M. 1973: New Cercospora spp. from West Bengal IV. Indian Phytopathology
26: 685 – 690.
McNeill, J. et al. 2006: International Code of Botanical Nomenclature (Vienna Code). Regnum
Vegetabile, Vol. 146. A.R.G. Gantner Verlag, Ruggell.
Addresses of the authors
Uwe Braun, Martin-Luther-Universität, Institut für Biologie, Bereich Geobotanik und
Botanischer Garten, Herbarium, Neuwerk 21, D-06099 Halle (Saale), Gemany.
(E-mail: uwe.braun@botanik.uni-halle.de)
David F. Farr, Systematic Mycology & Microbiology Laboratory, USDA-ARS, Rm.
304, B011A, 10300 Baltimore Ave., Beltsville, MD, 20705, USA.
(E-mail: David.Farr@ars.usda.gov)
Andrew M. Minnis, Systematic Mycology & Microbiology Laboratory, USDA-ARS,
Rm. 304, B011A, 10300 Baltimore Ave., Beltsville, MD, 20705, USA.
(E-mail: Drew.Minnis@ars.usda.gov)
