Abstract
Two new species, Catathelasmalaorentou and C.subalpinum, are described on the basis of morphological characters, phylogenetic evidence, host preferences and geographic distributions. A taxonomic key to the known species in China is also provided to facilitate identification. Based on samples from temperate Asia, Europe and North America, the phylogeny of Catathelasma was reconstructed using the internal transcribed spacer (ITS) region, the large subunit (LSU) of the ribosomal DNA and the translation elongation factor 1-α (TEF1).The phylogenetic results showed that Catathelasma contains two monophyletic clades: the /subalpinum clade and the /imperiale clade. The Asian species C.laorentou and C.subalpinum are closely related to the North American C. sp. (labelled as C.ventricosum in GenBank) in the /subalpinum clade, whereas C.imperiale and C.singeri are closely related in the /imperiale clade.
Highlights
Catathelasma Lovejoy is the type genus of the mushroom family Catathelasmataceae Wasser (Wasser 1985; Sánchez-García et al 2016)
Besides four Chinese collections that were confirmed to be conspecific with C. imperiale, sequences generated from other specimens collected in south-western China formed two monophyletic clades here described as C. laorentou and C. subalpinum, respectively (Fig. 1); each clade was well supported by both Maximum Likelihood (ML) and Bayesian Inference (BI) in the internal transcribed spacer (ITS), large subunit (LSU), translation elongation factor 1-α (TEF1) and concatenated trees (Fig. 1), except that in the TEF1 phylogeny, C. subalpina is only represented by a single sequence
C. laorentou has abundant clamp connections, smaller basidiospores (9–11 × 5–6 μm), larger basidia (38–50 × 8–10 μm) and is found in coniferous forest dominated by P. yunnanensis and K. evelyniana from south-western China, while C. ventricosum is found alongside hardwood (Singer 1940)
Summary
Catathelasma Lovejoy is the type genus of the mushroom family Catathelasmataceae Wasser (Wasser 1985; Sánchez-García et al 2016). This genus was erected by Lovejoy (1910) based on the type species C. evanescens Lovejoy. Zai-Wei Ge et al / MycoKeys 62: 123–138 (2020) This genus have distinct tricholomatoid basidiomes, decurrent to adnate to sinuateadnexed lamellae, double annulus, white spores that are oblong, smooth, amyloid and acyanophilic, bilateral to subregular lamella trama, firm and white context, hyphae with clamp connections and an ixocutis, ixolattice or cutis as pileipellis. In 1985, Wasser established the Catathelasmataceae to contain the only member Catathelasma (Wasser 1985), and this family has recently been emended to include Callistosporium Singer, Guyanagarika Sánchez-García et al (2016), Macrocybe Pegler & Lodge, Pleurocollybia Singer and Pseudolaccaria Vizzini et al (Sánchez-García et al 2016)
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