Taxonomic Re-evaluation of Megacollybia Species in Korea

Abstract

The diversity of the genus Megacollybia in Korea was examined based on morphological observation and analysis of molecular data. Currently, the genus is consisted of nine species with a global distribution. However, only M. platyphylla has been reported in the floral survey of Korea. During our re-evaluation of the taxonomic diversity of Megacollybia in Korea, six Megacollybia specimens collected in 2012 were identified based on internal transcribed spacer (ITS) sequences and morphology. Here, we report two Megacollybia species, M. clitocyboidea and M. marginata, as newly recorded species from Korea. The microscopic features of the two species are provided in this study. To our knowledge, this is the first phylogenetic analysis of Korean Megacollybia species.

Updated taxonomy on Gerronema (Porotheleaceae, Agaricales) with three new taxa and one new record from China

“… Gerronema kuruvense is always distinctly yellow, has small basidiomata (pileus < 11 mm in diameter) and true pileocystidia, and lacks cheilocystidia ( Latha et al 2018 ). Finally, G. strombodes , distributed in North America and Asia, differs from G. baishanzuense in having larger basidiomata, a white to grayish white pileus (up to 80 mm wide), smooth pileipellis hyphae, and the absence of hymenial cystidia ( Singer 1970 ; Antonín et al 2008 ; Kim et al 2014 ). G. citrinum (Corner) Pegler ( Pegler 1983 ) and G. tenue Dennis ( Dennis 1961 ), are allied with G. baishanzuense , but their lamellae edges without cheilocystidia.…”

“…Compared with G. microcarpum , G. subchrysophyllum (Murrill) Singer has an olive-umber pileus fading to grayish when old, larger and ellipsoid basidiospores (4.3–8.5 × 2.5–6.3 μm), and sometimes basidiole-like cheilocystidia ( Singer 1970 ). Gerronema keralense and G. strombodes are easily mistaken for G. microcarpum , but both the two closely related species are distinguishable by their absence of cheilocystidia or their partially thick-walled pileipellis and stipitipellis ( Singer 1970 ; Antonín et al 2008 ; Latha et al 2018 ; Kim et al 2014 ).…”

“…Having a sarcodimitic tissue structure, G. nemorale fits well within the currently restricted concept of the genus Gerronema ( Redhead 1986 ; Norvell et al 1994 ). Gerronema nemorale seems to be rather common in the East Asian region ( Takahashi 2000 ; Antonín et al 2008 ; Kim et al 2014 ; Aqdus and Khalid 2021 ). Kim et al (2014) has reported a basidiospore size of 6.0–8.2 × 3.5–4.8 μm for G. nemorale collected from Mount Halla (Jeju Island) in southwestern Korea, which is distinctly smaller than that of other specimens from Korea, Japan, Pakistan, and our collections ( Takahashi 2000 ; Antonín et al 2008 ; Kim et al 2014 ; Aqdus and Khalid 2021 ).…”

“… Gerronema nemorale seems to be rather common in the East Asian region ( Takahashi 2000 ; Antonín et al 2008 ; Kim et al 2014 ; Aqdus and Khalid 2021 ). Kim et al (2014) has reported a basidiospore size of 6.0–8.2 × 3.5–4.8 μm for G. nemorale collected from Mount Halla (Jeju Island) in southwestern Korea, which is distinctly smaller than that of other specimens from Korea, Japan, Pakistan, and our collections ( Takahashi 2000 ; Antonín et al 2008 ; Kim et al 2014 ; Aqdus and Khalid 2021 ). Gerronema tenue Dennis, described from Venezuela, is allied with G. nemorale , but the latter differs in having a citrine yellow pileus, an insititious stipe, and lamellae edges without cheilocystidia ( Dennis 1961 ).…”

First report of Megacollybia platyphylla (Marasmiaceae) from India based on morphology and molecular phylogenetic inferences

“…Megacollybia Kotl. & Pouzar is a well‐known genus of the family Marasmiaceae , consisting of about 10 species from all over the world and about two taxa reported from India (Coimbra et al, 2013; Gogoi & Parkash, 2015; Hughes et al, 2007; Kim et al, 2014; Manimohan et al, 2014). Morphologically, the members of this genus are characterized by collybioid to clitocyboid or tricholomatoid basidiomata, gray‐brown pileus covered with fibrillose and finely radially fibrillose‐streaked, distant, white lamellae, and white mycelial strands attached to the stipe base (Breitenbach & Kränzlin, 1991).…”