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Habitus of new species of Trypetheliaceae (isotypes). A–C, habitus. A, Polymeridium endoflavens; B, Trypethelium luteolucidum; C, Viridothelium leptoseptatum. D–H, ascospores. D & E, Astrothelium sinuosum showing the gelatinous sheath with wavy outline; F, Astrothelium curvatum; G, Viridothelium leptoseptatum, asci; H, Trypethelium luteolucidum. Scales: A–C = 1 mm; D–H = 10 μm. In colour online.
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The following 16 new species of Trypetheliaceae are described from Brazil: Astrothelium aeneoides Aptroot, differing from A. aeneum by the absence of pigment on the thallus, but medulla of pseudostroma K+ blood red and ascospores 3-septate, lumina diamond-shaped; A. curvatum Aptroot & M. Cáceres with immersed pyriform ascomata with lateral ostioles...
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The following 24 new species of Trypetheliaceae are described after three weeks of fieldwork in an area with a radius of 50 km around Porto Velho in Rondônia: Astrothelium bivelum with astrothelioid ascomata, 5-septate ascospores with polar gelatinous caps, and a thallus without lichexanthone; A. curvisporum with bent, 5-septate ascospores of 115–1...
Citations
... This resulted in the recognition of several new species (e.g. Aptroot and Cáceres (2016); Aptroot and Lücking (2016); Aptroot et al. (2016bAptroot et al. ( , 2019Aptroot et al. ( , 2022; Flakus et al. (2016); Lücking et al. (2016b); Cáceres and Aptroot (2017); Aptroot and Weerakoon (2018); Hongsanan et al. (2020); Jiang et al. (2022)). ...
... Astrothelium sanguinarium (Malme) Aptroot & Lücking differs in the shape of pseudostromata, the pigment is red (isohypocrellin), reacts K+ yellowgreen and is present internally within pseudostromata. Astrothelium sanguineoxanthum Aptroot has smaller (up to 86 μm long) ascospores, whitish pseudostromata and produces lichexanthone and isohypocrellin (internal in pseudostromata) (Aptroot and Lücking 2016;Aptroot et al. 2016bAptroot et al. , 2019Flakus et al. 2016;Aptroot 2021). ...
Two new species of Astrothelium are described from the Yungas forest in Bolivian Andes. Astrothelium chulumanense is characterised by pseudostromata concolorous with the thallus, perithecia immersed for the most part, with the upper portion elevated above the thallus and covered, except the tops, with orange pigment, apical and fused ostioles, the absence of lichexanthone (but thallus UV+ orange-yellow), clear hamathecium, 8-spored asci and amyloid, large, muriform ascospores with median septa. Astrothelium isidiatum is known only in a sterile state and produces isidia that develop in groups on areoles, but easily break off to reveal a medulla that resembles soralia. Both species, according to the two-locus phylogeny, belong to Astrothelium s.str. The production of isidia is reported from the genus Astrothelium and the family Trypetheliaceae for the first time.
... Numerous studies have been carried out on the diversity, ecology and application, of lichens in the Brazilian Northeast (e.g., Aptroot & Cá ceres 2016aAptroot et al. 2013Aptroot et al. , 2016Barbosa-Silva et al. 2019;Cáceres 2007;Cáceres et al. 2008aCáceres et al. ,b, 2017Leite et al. 2015;Lima et al. 2013aLima et al. ,b, 2016Menezes et al. 2011Menezes et al. , 2018Pereira et al. 2018;Santiago et al. 2018;Sulzbacher et al. 2016), which have contributed to the expansion of knowledge about these organisms in the region. Yet, new species are continuously unveiled. ...
In the past decade Graphidaceae has stood out as one of the families with the highest number
of newly described species in Brazil. In this paper we describe further five new species of Graphidaceae
found in an enclave of humid forest (Brejo de Altitude) in the Caatinga, and in the Atlantic Forest of
Northeast Brazil: Chapsa inspersa E.L.Lima & Lucking, differing from¨ C. dissuta in the inspersed
hymenium and larger ascospores with more numerous septa; Cryptoschizotrema minus E.L.Lima &
Lucking, differing from¨ C. schizotrema in the distinctly smaller ascospores; Diorygma sophianum E.L.Lima
& Lucking, differing from¨ D. junghuhnii in the laterally carbonized excipulum and the slightly larger
ascospores, as well as the presence of lichexanthone; Graphis subfiliformis E.L.Lima & Lucking, differing¨
from G. filiformis in the thick, shallowly verrucose thallus and thalline margin of the lirellae and in the
larger ascospores; and Sarcographa atlantica E.L.Lima & Lucking, differing from¨ S. astroidea (Vain.)
Lucking comb. nov. in the larger ascospores with more numerous septa. We also provide a range and¨
habitat extension for Diorygma alagoense M.Ca´ceres & Lucking, an enigmatic species with a peculiar¨
chemistry of thallus and ascomata.
... surface structure and emergence), hymenial inspersion, ascospore size, and secondary chemistry (including lichexanthone) are diagnostic at the species level, much more so than previously believed; hence, a much larger number of species is recognized here based on a revised species concept alone (exluding the many novel taxa described elsewhere in this issue). For example, the rich material available from Rondônia and Sergipe in Brazil (Aptroot & Cáceres 2016;Aptroot et al. 2016b), with several hundred collections representing over 70 taxa, and from Venezuela (Komposch & Hafellner 1999;, with c. 300 collections belonging to 40 species, allowed us to analyze morphological and anatomical variation in some of the common taxa. As an example, the ascospore width and length of all specimens of the Astrothelium conicumaggregate were analyzed showing that the species recognized within this complex are separated on a combination of UV-reaction and ascospore dimensions. ...
... This also strongly suggests that many species still remain undiscovered, as shown by a statistical prediction exercise (Aptroot et al. 2016c). This is corroborated by the fact that a few short field trips in small areas in Brazil yielded many undescribed species (Aptroot & Cáceres 2016;Aptroot et al. 2016b;Lücking et al. 2016a), and also taxonomic inventories of other understudied areas, such as Panama and Bolivia, unravelled numerous novel taxa (Flakus et al. 2016;Lücking et al. 2016b). ...
A revisionary synopsis is presented for the family Trypetheliaceae , based on a separately published phylogenetic analysis of a large number of species, morpho-anatomical and chemical study of extensive material, and revision of numerous type specimens. A total of 418 species is formally accepted in this synopsis, distributed among 15 genera as follows: Aptrootia (3), Architrypethelium (7), Astrothelium (242), Bathelium (16), Bogoriella (29), Constrictolumina (9), Dictyomeridium (7), Distothelia (3), Marcelaria (3), Nigrovothelium (2), Novomicrothelia (1), Polymeridium (50), Pseudopyrenula (20), Trypethelium (16), and Viridothelium (10). All accepted genera, including new genera described separately in this issue, are keyed out and briefly described and discussed, and keys are provided for all accepted species within each genus. Entries with full synonymy and brief descriptions, and in part also discussions, are provided for all accepted species, except those newly described elsewhere in this issue, which are cross-referenced in the corresponding keys. The description of the newly defined genera takes into account phylogeny in combination with morpho-anatomical features with the result that they are mostly recognizable by a combination of thallus, ascoma and ascospore features. Most species previously assigned to the genera Astrothelium , Campylothelium , Cryptothelium , and Trypethelium , based on a schematic concept of ascoma morphology and ascospore septation, are now included in a single genus, Astrothelium , with highly variable ascoma morphology and ascospore septation but invariably with astrothelioid ascospores (at least when young), that is diamond-shaped lumina, and a well-developed, corticate, usually olive-green thallus that often covers the ascomata. While the genera Aptrootia (large, brown, muriform ascospores), Architrypethelium (large, mostly 3-septate ascospores), and Pseudopyrenula (ecorticate, white thalli and astrothelioid ascospores) are maintained, Trypethelium is redefined to include species with raised, pseudostromatic ascomata and multiseptate ascospores with thin septa. The sister group of Trypethelium is the genus Marcelaria , with brightly coloured pseudostromata and muriform ascospores. Bathelium is now limited to species with strongly raised, fully exposed pseudostromata and septate to muriform ascospores with thin septa. Several genera are recognized for more basal lineages with mostly ecorticate, white thalli and solitary, exposed ascomata previously assigned to Arthopyrenia , Mycomicrothelia and Polymeridium , viz . Bogoriella , Constrictolumina , Dictyomeridium , and Novomicrothelia . In addition, separate genera are accepted for the Trypethelium tropicum ( Nigrovothelium ) and T. virens ( Viridothelium ) groups. In addition, a refined species concept resulting from phylogenetic studies is employed which pays particular attention to morphological features of the thallus and ascomata. Of a total of 526 names checked, 107 remain synonyms of accepted names and a further eight are newly excluded from the family. Based on these redispositions, the following 146 new combinations are proposed, including reinstatement of numerous names previously subsumed into synonymy: Architrypethelium columbianum (Nyl.) Aptroot & Lücking comb. nov., A. grande (Kremp.) Aptroot & Lücking comb. nov., Astrothelium aeneum (Eschw.) Aptroot & Lücking comb. nov., A. alboverrucum (Makhija & Patw.) Aptroot & Lücking comb. nov., A. amazonum (R. C. Harris) Aptroot & Lücking comb. nov., A. ambiguum (Malme) Aptroot & Lücking comb. nov., A. andamanicum (Makhija & Patw.) Aptroot comb. nov., A. annulare (Spreng.) Aptroot & Lücking comb. nov., A. aurantiacum (Makhija & Patw) Aptroot & Lücking comb. nov., A. auratum (R. C. Harris) Aptroot & Lücking comb. nov., A. aureomaculatum (Vain.) Aptroot & Lücking comb. nov., A. basilicum (Kremp.) Aptroot & Lücking comb. nov., A. bicolor (Taylor) Aptroot & Lücking comb. nov., A. buckii (R. C. Harris) Aptroot & Lücking comb. nov., A. calosporum (Müll. Arg.) Aptroot & Lücking comb. nov., A. cartilagineum (Fée) Aptroot & Lücking comb. nov., A. cecidiogenum (Aptroot & Lücking) Aptroot & Lücking comb. nov., A. ceratinum (Fée) Aptroot & Lücking comb. nov., A. chapadense (Malme) Aptroot & Lücking comb. nov., A. chrysoglyphum (Vain.) Aptroot & Lücking comb. nov., A. chrysostomum (Vain.) Aptroot & Lücking comb. nov., A. cinereorosellum (Kremp.) Aptroot & Lücking comb. nov., A. cinereum (Müll. Arg.) Aptroot & Lücking comb. et stat. nov., A. confluens (Müll. Arg.) Aptroot & Lücking comb. nov., A. consimile (Müll. Arg.) Aptroot & Lücking comb. nov., A. deforme (Fée) Aptroot & Lücking comb. nov., A. defossum (Müll. Arg.) Aptroot & Lücking comb. nov., A. degenerans (Vain.) Aptroot & Lücking comb. nov., A. dissimilum (Makhija & Patw.) Aptroot & Lücking comb. nov., A. effusum (Aptroot & Sipman) Aptroot & Lücking comb. nov., A. endochryseum (Vain.) Aptroot & Lücking comb. nov., A. exostemmatis (Müll. Arg.) Aptroot & Lücking comb. nov., A. feei (C. F. W. Meissn.) Aptroot & Lücking comb. nov., A. ferrugineum (Müll. Arg.) Aptroot & Lücking comb. nov., A. galligenum (Aptroot) Aptroot & Lücking comb. nov., A. gigantosporum (Müll. Arg.) Aptroot & Lücking comb. nov., A. indicum (Upreti & Ajay Singh) Aptroot & Lücking comb. nov., A. infossum (Nyl.) Aptroot & Lücking comb. nov., A. infuscatulum (Müll. Arg.) Aptroot & Lücking comb. nov., A. irregulare (Müll. Arg.) Aptroot & Lücking comb. nov., A. keralense (Upreti & Ajay Singh) Aptroot & Lücking comb. nov., A. kunzei (Fée) Aptroot & Lücking comb. nov., A. leioplacum (Müll. Arg.) Aptroot & Lücking comb. nov., A. lugescens (Nyl.) Aptroot & Lücking comb. nov., A. luridum (Zahlbr.) Aptroot & Lücking comb. nov., A. macrocarpum (Fée) Aptroot & Lücking comb. nov., A. macrosporum (Makhija & Patw.) Aptroot & Lücking comb. nov., A. marcidum (Fée) Aptroot & Lücking comb. nov., A. megaleium (Kremp.) Aptroot & Lücking comb. nov., A. megalophthalmum (Müll. Arg.) Aptroot & Lücking comb. nov., A. megalostomum (Vain.) Aptroot & Lücking comb. nov., A. megaspermum (Mont.) Aptroot & Lücking comb. nov., A. meiophorum (Nyl.) Aptroot & Lücking comb. nov., A. meristosporoides (P. M. McCarthy & Vongshew.) Aptroot & Lücking comb. nov., A. meristosporum (Mont. & Bosch) Aptroot & Lücking comb. nov., A. neogalbineum (R. C. Harris) Aptroot & Lücking comb. nov., A. nigratum (Müll. Arg.) Aptroot & Lücking comb. et stat. nov., A. nigrorufum (Makhija & Patw.) Aptroot & Lücking comb. nov., A. nitidiusculum (Nyl.) Aptroot & Lücking comb. nov., A. octosporum (Vain.) Aptroot & Lücking comb. nov., A. oligocarpum (Müll. Arg.) Aptroot & Lücking comb. nov., A. olivaceofuscum (Zenker) Aptroot & Lücking comb. nov., A. papillosum (P. M. McCarthy) Aptroot & Lücking comb. nov., A. papulosum (Nyl.) Aptroot & Lücking comb. nov., A. peranceps (Kremp.) Aptroot & Lücking comb. nov., A. phaeothelium (Nyl.) Aptroot & Lücking comb. nov., A. phlyctaenua (Fée) Aptroot & Lücking comb. nov., A. porosum (Ach.) Aptroot & Lücking comb. nov., A. praetervisum (Müll. Arg.) Aptroot & Lücking comb. nov., A. pseudoplatystomum (Makhija & Patw.) Aptroot & Lücking comb. nov., A. pseudovariatum (Upreti & Ajay Singh) Aptroot & Lücking comb. nov., A. puiggarii (Müll. Arg.) Aptroot & Lücking comb. nov., A. pulcherrimum (Fée) Aptroot & Lücking comb. nov., A. pupula (Ach.) Aptroot & Lücking comb. nov., A. purpurascens (Müll. Arg.) Aptroot & Lücking comb. nov., A. pustulatum (Vain.) Aptroot & Lücking comb. nov., A. rufescens (Müll. Arg.) Aptroot & Lücking comb. et stat. nov., A. sanguinarium (Malme) Aptroot & Lücking comb. nov., A. santessonii (Letr.-Gal.) Aptroot & Lücking comb. nov., A. saxicola (Malme) Aptroot & Lücking comb. nov., A. scoria (Fée) Aptroot & Lücking comb. nov., A. scorizum (Müll. Arg.) Aptroot & Lücking comb. nov., A. sierraleonense (C. W. Dodge) Aptroot & Lücking comb. nov., A. sikkimense (Makhija & Patw.) Aptroot & Lücking comb. nov., A. spectabile (Aptroot & Ferraro) Aptroot & Lücking comb. nov., A. sphaerioides (Mont.) Aptroot & Lücking comb. nov., A. stramineum (Malme) Aptroot & Lücking comb. nov., A. straminicolor (Nyl.) Aptroot & Lücking comb. nov., A. subcatervarium (Malme) Aptroot & Lücking comb. nov., A. subdiscretum (Nyl.) Aptroot & Lücking comb. nov., A. subdisjunctum (Müll. Arg.) Aptroot & Lücking comb. nov., A. subdissocians (Nyl. ex Vain.) Aptroot & Lücking comb. et stat. nov., A. superbum (Fr.) Aptroot & Lücking comb. nov., A. tenue (Aptroot) Aptroot & Lücking comb. nov., A. thelotremoides (Nyl.) Aptroot & Lücking comb. nov., A. trypethelizans (Nyl.) Aptroot & Lücking comb. nov., A. tuberculosum (Vain.) Aptroot & Lücking comb. nov., A. ubianense (Vain.) Aptroot & Lücking comb. nov., A. variatum (Nyl.) Aptroot & Lücking comb. nov., A. vezdae (Makhija & Patw.) Aptroot & Lücking comb. nov., Bathelium austroafricanum (Zahlbr.) Aptroot & Lücking comb. nov., B. nigroporum (Makhija & Patw.) Aptroot & Lücking comb. nov., Bogoriella alata (Groenh. ex Aptroot) Aptroot & Lücking comb. nov., B. annonacea (Müll. Arg.) Aptroot & Lücking comb. nov., B. apposita (Nyl.) Aptroot & Lücking comb. nov., B. captiosa (Kremp.) Aptroot & Lücking comb. nov., B. collospora (Vain.) Aptroot & Lücking comb. nov., B. confluens (Müll. Arg.) Aptroot & Lücking comb. nov., B. conothelena (Nyl.) Aptroot & Lücking comb. nov., B. decipiens (Müll. Arg.) Aptroot & Lücking comb. nov., B. exigua (Müll. Arg.) Aptroot & Lücking comb. nov., B. fumosula (Zahlbr.) Aptroot & Lücking comb. nov., B. hemisphaerica (Müll. Arg.) Aptroot & Lücking comb. nov., B. lateralis (Sipman) Aptroot & Lücking comb. nov., B. leuckertii (D. Hawksw. & J. C. David) Aptroot & Lücking comb. nov., B. macrocarpa (Komposch, Aptroot & Hafellner) Aptroot & Lücking comb. nov., B. megaspora (Aptroot & M. Cáceres) Aptroot & Lücking comb. nov., B. miculiformis (Nyl. ex Müll. Arg.) Aptroot & Lücking comb. nov., B. minutula (Zahlbr.) Aptroot & Lücking comb. nov., B. modesta (Müll. Arg.) Aptroot & Lücking comb. nov., B. nonensis (Stirt.) Aptroot & Lücking comb. nov., B. obovata (Stirt.) Aptroot & Lücking comb. nov., B. pachytheca (Sacc. & Syd.) Aptroot & Lücking comb. nov., B. punctata (Aptroot) Aptroot & Lücking comb. nov., B. queenslandica (Müll. Arg.) Aptroot & Lücking comb. nov., B. socialis (Zahlbr.) Aptroot & Lücking comb. nov., B. striguloides (Sérus. & Aptroot) Aptroot & Lücking comb. nov., B. subfallens (Müll. Arg.) Aptroot & Lücking comb. nov., B. thelena (Ach.) Aptroot & Lücking comb. nov., B. triangularis (Aptroot) Aptroot & Lücking comb. nov., B. xanthonica (Komposch, Aptroot & Hafellner) Aptroot & Lücking comb. nov., Constrictolumina esenbeckiana (Fée) Lücking, M. P. Nelsen & Aptroot comb. nov., C. leucostoma (Müll. Arg.) Lücking, M. P. Nelsen & Aptroot comb. nov., C. lyrata (R. C. Harris) Lücking, M. P. Nelsen & Aptroot comb. nov., C. majuscula (Nyl.) Lücking, M. P. Nelsen & Aptroot comb. nov., C. malaccitula (Nyl.) Lücking, M. P. Nelsen & Aptroot comb. nov., C. porospora (Vain.) Lücking, M. P. Nelsen & Aptroot comb. nov., Dictyomeridium amylosporum (Vain.) Aptroot, M. P. Nelsen & Lücking comb. nov., D. campylothelioides (Aptroot & Sipman) Aptroot, M. P. Nelsen & Lücking comb. nov., D. immersum (Aptroot, A. A. Menezes & M. Cáceres) Aptroot, M. P. Nelsen & Lücking comb. nov., D. isohypocrellinum (Xavier-Leite, M. Cáceres & Aptroot) Aptroot, M. P. Nelsen & Lücking comb. nov., D. paraproponens (Aptroot, M. Cáceres & E. L. Lima) Aptroot, M. P. Nelsen & Lücking comb. nov., Distothelia rubrostoma (Aptroot) Aptroot & Lücking comb. nov., Phyllobathelium chlorogastricum (Müll. Arg.) Aptroot & Lücking comb. nov., Pseudopyrenula cubana (Müll. Arg.) Aptroot & Lücking comb. nov., Viridothelium cinereoglaucescens (Vain.) Lücking, M. P. Nelsen & Aptroot comb. nov., V. indutum (Stirt.) Aptroot & Lücking comb. nov., and V. megaspermum (Makhija & Patw.) Aptroot & Lücking comb. nov. In addition, six replacement names are proposed: Astrothelium campylocartilagineum Aptroot & Lücking nom. nov., A. grossoides Aptroot & Lücking nom. nov., A. octosporoides Aptroot & Lücking nom. nov., A. scoriothelium Aptroot & Lücking nom. nov., A. pyrenastrosulphureum Aptroot & Lücking nom. nov., and Bathelium pruinolucens Aptroot & Lücking nom. et stat. nov. Along with this, 57 lectotypes are newly designated. Most species (392 out of 418) are illustrated, with a total of 697 images in 59 plates, including 406 type specimens. Where appropriate, taxa are briefly discussed. New country or continental records are listed for many species in their revised circumscription. A checklist of taxa described or placed in genera belonging in Trypetheliaceae but previously excluded from the family, and their current names, is also provided.
We provide an expanded and updated, 2-locus phylogeny (mtSSU, nuLSU) of the lichenized fungal family Trypetheliaceae, with a total of 196 ingroup OTUs, in order to further refine generic delimitations and species concepts in this family. As a result, the following 15 clades are recognized as separate genera, including five newly established genera: Aptrootia, Architrypethelium, Astrothelium (including the bulk of corticate species with astrothelioid ascospores; synonyms: Campylothelium, Cryptothelium, Laurera), Bathelium s. str. (excluding B. degenerans and relatives which fall into Astrothelium), the reinstated Bogoriella (for tropical, lichenized species previously placed in Mycomicrothelia), Constrictolumina gen. nov. (for tropical, lichenized species of Arthopyrenia), Dictyomeridium gen. nov. (for a subgroup of species with muriform ascospores previously placed in Polymeridium), Julella (provisionally, as the type species remains unsequenced), Marcelaria (Laurera purpurina complex), Nigrovothelium gen. nov. (for the Trypethelium tropicum group), Novomicrothelia gen. nov. (for an additional species previously placed in Mycomicrothelia), R. Lücking: Botanical Garden and Botanical Museum
Mycotaxon is pleased to add a new annotated species distribution list to our 146 previously posted free-access fungae. The 39-page "Checklist of the lichens of The Reserva Florestal Adolphe Ducke in Manaus" by Aptroot, Cavalcante, Santos, Junior, Lima, and Cáceres may be downloaded from our website via http://www.mycotaxon.com/mycobiota/index.html
Mycotaxon is pleased to add a new annotated species distribution list to our 144 previously posted free access fungae. The 49-page "Lichens from Brazil: a checklist of lichenized fungi from Acre, in the Amazon" by Aptroot, Santos, Oliveira, Cavalcante, and Cáceres may be downloaded from our website via http://www.mycotaxon.com/mycobiota/index.html
Amazon, Atlantic forest, Brejos de Altitude, Caatinga, Carrasco, Cerradão and Restinga are major vegetation units in North and Northeast Brazil. Little is known about lichen metacommunity structure in these habitats. While species richness and composition generally depend on climatic factors, in azonal vegetation edaphic factors may have a filtering effect on tree bark structure and hence the composition of epiphytic lichen communities. We hypothesized that climatic stress and a tree bark filtering effect would result in reduced richness and phylogenetic clustering in Caatinga, Carrasco, Cerradão and Restinga, whereas high richness and phylogenetic overdispersion were predicted for Amazon and Atlantic Forest. To test this, we analyzed 2,090 lichenized species in the study area, with a supertree to assess phylogenetic metacommunity structure. Amazon and Atlantic forest exhibited high richness and phylogenetic diversity, with phylogenetic overdispersion only in the Amazon. The zonal Caatinga with drought stress and the extrazonal Brejos both exhibited phylogenetic clustering. Among the azonal, edaphic vegetation units, Cerradão exhibited phylogenetic overdispersion, whereas Restinga showed phylogenetic clustering. Nearest taxon phylogenetic distance indicated a close relationship between Amazon and Atlantic forest, Atlantic forest and Brejos and Atlantic forest and Caatinga. Carrasco was mostly closely related to Cerradão, and Restinga was distantly related to any other unit. These findings indicate more complex patterns in the phylogenetic structure of lichen metacommunities, partly reflecting those of plant metacommunities, as a result of concurrent macroecological evolutionary histories. Our data supported floristic evidence that Carrasco is part of the Cerrado complex and not related to Caatinga.
The diversity of Leptogium has been underestimated in Mato Grosso do Sul, Brazil. Nine species are being reported for the first time to the state, including L. microcarpum, as new record to Brazil; and L. cyanizum, as new record to the American continent. Furthermore, L. hondae, L. moluccanum var. denticulatum and L. quilombensis are proposed as new to science. The first key to species of Leptogium is provided for this region, which can also be used for surrounding regions in Brazil.
Ten new species of Trypetheliaceae are described: Astrothelium bullatothallinum from Venezuela, which is close to A. aeneum but differs by the bullate thallus with a thick cortex, intermixed in a mosaic with the prothallus; A. cayennense from French Guiana, which is similar to A. flavomegaspermum but with a yellow pigment in the pseudostroma near the ostioles; A. diaphanocorticatum from Papua New Guinea, which has a bullate thallus with a thick hyaline cortex and 3-septate ascospores of 25–28×10–12 μm; A. macroeustomum from French Guiana, with joint lateral ostioles, UV+ yellow ostiolar region and 5-septate ascospores of 50–55×12–17 μm; A. minicecidiogenum from Costa Rica, with muriform ascospores of 70–90×20–25 μm, without pseudostromata, with solitary ascomata, lateral ostioles and an inspersed hamathecium; A. palaeoexostemmatis from Thailand, which is similar to A. exostemmatis but with larger, I+ blue ascospores; A. quasimamillanum from Brazil, with muriform ascospores of 30–33×9·5–10·5 μm, without pseudostromata, with solitary ascomata, lateral ostioles and an inspersed hamathecium; A. studerae from Brazil, with astrothelioid ascomata, lichexanthone only in the pseudostromata, 3-septate ascospores of 21·5–23·0×6·5–7·5 μm; A. tanianum from Malaysia, with a bullate thallus, solitary ascomata, covered by the thallus, (9–)11(–15)-septate ascospores, 75–100×20–22 μm; and Pseudopyrenula miniflavida from Brazil, with a yellow-inspersed hamathecium, the inspersion dissolving in KOH without colour change, and 3-septate ascospores, 15–17×5·5–6·5 μm. The unusually thick, hyaline cortical layer of the thallus of Astrothelium diaphanocorticatum , through which the individual algal cells are clearly visible, is discussed. Furthermore, 30 species are reported from 34 countries in which they had previously been unrecorded; one ( Astrothelium inspersaeneum ) is from a new continent, Asia.
