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Agaricus flocculosipes sp. nov., a new potentially cultivatable species from the palaeotropics
(2012-01-01)
Zhao, Rui Lin
;
Hyde, Kevin D.
;
Desjardin, Dennis E.
;
Raspé, Olivier
;
Soytong, Kasem
Agaricus flocculosipes is described as new from northern Thailand and Mayotte based on morphology and ITS sequence analysis. The new species is compared with similar taxa, and a comprehensive description, line drawings, and colored photographs are provided. Agaricus flocculosipes is distinguished among the species in section Arvenses by its relatively large sporocarps (110-180 mm in diameter), erect floccose squamules on the surface of the stipe, and relatively small basidiospores (less than 6.5 μm long). Phylogenetic analyses based on ITS sequence data using maximum likelihood, parsimony, and Bayesian analyses all support A. flocculosipes as being a distinct species within section Arvenses. The new taxon is potentially cultivatable as it is presumably heterothallic, exhibits extensive genetic diversity, and occurs in section Arvenses, a lineage that contains other edible cultivatable taxa such as Agaricus arvensis and Agaricus subrufescens. © 2012 The Mycological Society of Japan and Springer.
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Two species of Agaricus sect. Xanthodermatei from Thailand
(2012-01-01)
Zhao, Rui Lin
;
Desjardin, Dennis E.
;
Callac, Philippe
;
Parra, Luis A.
;
Guinberteau, Jacques
Agaricus murinocephalus is described and illustrated as a new species. This taxon, presently known only from Thailand, is characterized by a context that generally does not discolor on exposure, the lack of a phenolic odor, a cap covered by very fine, appressed, dark grey squamules outside the grey disc on a whitish background, and a broken collar-like annulus. Agaricus endoxanthus, previously reported from South America, Europe, and Asia, is recorded for the first time in Thailand. Morphological and published molecular analyses place both taxa in A. sect. Xanthodermatei based on. © 2012. Mycotaxon, Ltd.
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A monograph of Micropsalliota in Northern Thailand based on morphological and molecular data
(2010-12-01)
Zhao, Rui Lin
;
Desjardin, Dennis E.
;
Soytong, Kasem
;
Perry, Brian A.
;
Hyde, Kevin D.
Using a combination of morphological and molecular data, the genus Micropsalliota is shown to represent a monophyletic lineage in the Agaricaceae sister to Hymenagaricus. Features that distinguish the genus from Agaricus and allied genera include usually small, gracile basidiomes with a membranous partial veil, dextrinoid basidiospores with an apically thickened endosporium and lack of a germ pore, capitate or subcapitate, conspicuous cheilocystidia, and incrusted pileipellis hyphae that turn green in ammonia solution. We provide a monographic treatment of 23 taxa of Micropsalliota from Northern Thailand, of which 13 taxa represent new distribution reports for Thailand and 10 represent new taxa, including M. allantoidea, M. bifida, M. furfuracea, M. lateritia var. vinaceipes, M. megarubescens, M. megaspora, M. pusillissima, M. rubrobrunnescens var. rubrobrunnescens, M. rubrobrunnescens var. tibiicystis, and M. suthepensis. Included in this monograph are comprehensive descriptions, illustrations of micromorphological features, photographs of basidiomes, comparisons with allied species, phylogenetic trees inferring relationships amongst Thai species based on nrITS and nrLSU sequence datasets, and a key to aid in diagnosis. © 2010 Kevin D. Hyde.
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Ribosomal DNA phylogenies of Cyathus: Is the current infrageneric classification appropriate?
(2007-05-01)
Zhao, Rui Lin
;
Jeewon, Rajesh
;
Desjardin, Dennis E.
;
Soytong, Kasem
;
Hyde, Kevin D.
Phylogenetic relationships within the genus Cyathus (bird's nest fungi) were investigated with neighbor joining, maximum likelihood, weighted maximum parsimony and MrBayes analyses of ITS and LSU ribosomal DNA sequences datasets. Twenty-two taxa of Cyathus were used in the analyses based primarily on type and authentic specimens. The current infrageneric classification system of Brodie recognizes seven infrageneric groups based on morphological characters, including peridium plications and variations in peridium hair anatomy, peridiole structure and fruit-body color. These groups are not supported by molecular data. Instead the ITS and LSU datasets support recognition of three infrageneric groups herein named the ollum, pallidum and striatum groups. Morphological characters useful in distinguishing these groups include basidiospore size, fruit-body coloration and peridium anatomy. Cyathus africanus var. latisporus is considered a synonym of Cyathus jiayuguanensis, and a new combination Cyathus lanatus (Brodie) R.L. Zhao is proposed based on morphological and molecular data. © 2007 by The Mycological Society of America.
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Proposed synonyms in Cyathus
(2006-01-01)
Zhao, Rui Lin
;
Desjardin, Dennis E.
;
Soytong, Kasem
;
Hyde, Kevin D.
Based on the morphological analyses of 48 taxa of Cyathus, including 30 type specimens, three Cyathus species were found to represent synonyms of existing species. Cyathus cheliensis, C. gansuensis and C. megasporus are herein accepted as synonyms of C. limbatus, C. pygmaeus and C. poeppigii, respectively. The latter three species are redescribed and illustrated.

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