VOLUME 3 JUNE 2019 Fungal Systematics and Evolution PAGES 41–56 doi.org/10.3114/fuse.2019.03.05 Mythicomycetaceae fam. nov. (Agaricineae, Agaricales) for accommodating the genera Mythicomyces and Stagnicola, and Simocybe parvispora reconsidered A. Vizzini1*, G. Consiglio2, M. Marchetti3 1Department of Life Sciences and Systems Biology, University of Torino, Viale P.A. Mattioli 25, I-10125 Torino, Italy 2Via Ronzani 61, I-40033 Casalecchio di Reno (Bologna), Italy 3Via Molise 8, I-56123 Pisa, Italy Key words: *Corresponding author:
[email protected] Agaricomycetes Basidiomycota Abstract: The analysis of a combined dataset including 5.8S (ITS) rDNA, 18S rDNA, 28S rDNA, and rpb2 data from molecular systematics species of the Agaricineae (Agaricoid clade) supports a shared monophyletic origin of the monotypic genera new taxa Mythicomyces and Stagnicola. The new family Mythicomycetaceae, sister to Psathyrellaceae, is here proposed Phaeocollybia to name this clade, which is characterised, within the dark-spored agarics, by basidiomata with a mycenoid to Psathyrellaceae phaeocollybioid habit, absence of veils, a cartilaginous-horny, often tapering stipe, which discolours dark brown taxonomy towards the base, a greyish brown, pale hazel brown spore deposit, smooth or minutely punctate-verruculose spores without a germ pore, cheilocystidia always present, as metuloids (thick-walled inocybe-like elements) or as thin- walled elements, pleurocystidia, when present, as metuloids, pileipellis as a thin ixocutis without cystidioid elements, clamp-connections present everywhere, and growth on wood debris in wet habitats of boreal, subalpine to montane coniferous forests. Simocybe parvispora from Spain (two collections, including the holotype), which clusters with all the sequenced collections ofStagnicola perplexa from Canada, USA, France and Sweden, must be regarded as a later synonym of the latter.