Species and genera in Aleurodiscus sensu lato as viewed from the Southern Hemisphere

RAJCHENBERG M.; PILDAIN M.B.; DE ERRASTI A.; RIQUELME C.; BECERRA J.; TORRES-DÍAZ C.; CABRERA-PARDO, J.R.

MYCOLOGIA.

ALLEN PRESS INC

Lugar: Lawrence; Año: 2021

0027-5514

Phylogenetic relationships of 12 species in Aleurodiscus sensu lato (Stereaceae,Russulales) described from the Patagonian forests of Chile and Argentina wereinvestigated based on sequences of nuc rDNA ITS1-5.8S-ITS2 (ITS) and the D1?D2domains of nuc 28S rDNA (28S). A new genus and a new species are presented and10 new combinations proposed. The genus Gloeosoma is shown to bephylogenetically well supported and morphologically circumscribed; it includes G.vitellinum (type species), G. mirabile comb. nov., G. zealandicum comb. nov., andGloeosoma decorticans sp. nov., which is newly described from Chile. The new genusStereodiscus is proposed to accommodate a group of taxa characterized by an australdistribution and morphologically by smooth, thin-walled, amyloid basidiospores and alack of gloeocystidia and acanthocystidia; three species develop Stereum-likebasidiomata and two species present discoid ones. The new genus includes thespecies formerly known as Aleurodiscus antarcticus, A. limonisporus, A. parmuliformis,A. patagonicus and A. triviale. Specimens of Stereodiscus parmuliformis (A.parmuliformis) from New Zealand (where it was originally described) and southernChile are shown to be phylogenetically conspecific, which confirms its presence inPatagonia. Gloeosoma and Stereodiscus are shown to be distantly related toAleurodiscus s.str. and other genera in Stereaceae. The new combinationsAleurocystidiellum bernicchiae, Aleurocystidiellum hallenbergii, and Acanthobasidiumquilae are proposed based on morphology and phylogenetic analyses, andAleurodiscus cerussatus is shown to be a cryptic species complex.