Trichocybe, a new genus for Clitocybe puberula (Agaricomycetes, Agaricales)

Abstract

Trichocybe, a new genus of Agaricales, is described to accommodate the rare species Clitocybe puberula characterized by an isolated phylogenetic position. Trichocybe is distinguished from its allied clitocyboid genera by a unique combination of macro-and micromorphological characters, including a Gymnopus-like habitus, a pubescent pileus with squamulose flocci, an eccentric stipe growing on wood debris, a putrescent non-reviviscent context, a strongly farinaceous odour, rare but clearlydifferentiated cheilocystidia, an unusual, strongly differentiated pileipellis, a subpellis with vesiculose-physaloid elements, a stipitipellis with diverticulate hyphae, and smooth, acyanophilous, inamyloid basidiospores. Trichocybe is so far known only from northwestern Europe. Based on a LSU-and 5.8S-rDNA Bayesian phylogenetic analysis, Trichocybe clusters within the Tricholomatoid clade, where it occupies an isolate position. Furthermore, according to the present analysis, also Clitocybe phaeophthalma seems to represent an independent evolutive line in the clitocyboid fungi, which suggests adopting the genus Singerocybe Harmaja for this taxon as well as similar ones.

Leucocalocybe, a new genus for Tricholoma ongolicum (Agaricales, Basidiomycota)

“…Nucleotide sequences of LSU obtained from this study (Table 1) were aligned with the sequences of the database in Vizzini et al (2010) to determine the taxa position (see supplementary material, Table 2). Sequences were also selected according to the outcomes of other phylogenetic studies of Agaricales (Table 2, Moncalvo et al, 2002;Matheny et al, 2006).…”

“…Bayesian analysis was conducted using MrBayes v.3.1.2 (Ronquist and Huelsenbeck, 2003). Bayesian analyses were run for 10 000 000 generations for the LSU dataset with the same parameters of Vizzini et al (2010). The topologies were used to generate a 50% majority rule consensus tree.…”

Biodiversity of wood-decay fungi in Italy

“…Genera with higher numbers of taxa are Mycena (Pers.) Roussel (56) Mycol Prog, and Gymnopus inexpectatus Consiglio, Vizzini, Antonín & Contu (Vizzini et al 2008 Vizzini, A, Consiglio, G, Antonin, V and (Vizzini et al 2010), and Tricholomopsis flammula Métrod.…”

Paralepistopsis gen. nov. and Paralepista (Basidiomycota, Agaricales)

“…Recent molecular studies that included a significant number of Clitocybe species , Matheny et al 2006, Vizzini et al 2010a,b, 2011 have shown that taxa in this traditional genus do not form a monophyletic group but rather a heterogeneous artificial set of disparate and (in many cases) phylogenetically unrelated taxa (the so-called clitocyboid fungi or Clitocybe s.l. ).…”