Browsing by Autor "Matthew P. Nelsen"

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    A phylogenetic framework for reassessing generic concepts and species delimitation in the lichenized family<i>Trypetheliaceae</i>(Ascomycota: Dothideomycetes)
    (Cambridge University Press, 2016) Robert Lücking; Matthew P. Nelsen; André Aptroot; Roselvira BARILLAS DE KLEE; Paulina A. Bawingan; Michel Navarro Benatti; Nguyễn Quốc Bình; Frank Bungartz; Marcela E. S. Cáceres; Luciana da Silva Canêz
    Abstract 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 ), Polymeridium s. str., Pseudopyrenula , Trypethelium s. str. ( T. eluteriae group), and Viridothelium gen. nov. (for the Trypethelium virens group). All recognized genera are phenotypically characterized and a discussion on the evolution of phenotypic features in the family is given. Based on the obtained phylogeny, species delimitations are revised and the importance of characters such as thallus morphology, hymenial inspersion, and secondary chemistry for taxonomic purposes is discussed, resulting in a refined species concept.
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    Ten new species of lichenized Basidiomycota in the genera Dictyonema and Cora (Agaricales: Hygrophoraceae), with a key to all accepted genera and species in the Dictyonema clade
    (Q15088586, 2013) Robert Lücking; Manuela Dal Forno; James D. Lawrey; Frank Bungartz; María E. Holgado-Rojas; ER Hernández; Marcelo Pinto Marcelli; Bibiana Moncada; Eduardo A. Morales; Matthew P. Nelsen
    As part of a larger systematic and taxonomic revision, including molecular phylogenetic analysis, of lichenized Basidiomycota in the Dictyonema clade, ten species are described as new from tropical America, seven in the foliose genus Cora and three in the filamentous genus Dictyonema: Cora arachnoidea J. E. Hern. &amp; Lücking, sp. nov., C. aspera Wilk, Lücking &amp; E. Morales, sp. nov., C. byssoidea Lücking &amp; Moncada, sp. nov., C. cyphellifera Dal-Forno, Bungartz &amp; Lücking, sp. nov., C. inversa Lücking &amp; Moncada, sp. nov., C. squamiformis Wilk, Lücking &amp; Yánez-Ayabaca, sp. nov., C. strigosa Lücking, E. Paz &amp; L. Salcedo, sp. nov., Dictyonema aeruginosulum Lücking, Nelsen &amp; Will-Wolf, sp. nov., D. diducens Nyl. ex Lücking, sp. nov., D. metallicum Lücking, Dal-Forno &amp; Lawrey, sp. nov., and D. obscuratum Lücking, Spielmann &amp; Marcelli, sp. nov. We discuss the taxonomic status of the six names historically established for species belonging in the genus Cora and reinstate the names C. gyrolophia Fr., C. pavonia (Sw.) Fr., and C. reticulifera Vain., providing diagnostic features for these, whereas the status of C. glabrata (Spreng.) Fr. and C. bovei Speg. remains uncertain. The following new combinations are introduced: Cora hirsuta (Moncada &amp; Lücking) Moncada &amp; Lücking, comb. nov., C. minor (Lücking, E. Navarro &amp; Sipman) Lücking, comb. nov., Corella melvinii (Chaves, Lücking &amp; Umaña) Lücking, Dal-Forno &amp; Lawrey, comb. nov., Cyphellostereum phyllogenum (Müll. Arg.) Lücking, Dal-Forno &amp; Lawrey, comb. nov., Dictyonema caespitosum (Johow) Lücking, comb. nov., D. irrigatum (Berk. &amp; M. A. Curtis) Lücking, comb. nov., D. phyllophilum (Parmasto) Lücking, Dal-Forno &amp; Lawrey, comb. et stat. nov., and D. scabridum (Vain.) Lücking, comb. et stat. nov. Keys are presented to the five currently accepted genera and 40 currently recognized species in the genera Cyphellostereum, Dictyonema, Cora, and Corella.