Pleurella ardesiaca is a lignicolous species from New Zealand characterized by smooth, amyloid spores and presence of cheilocystidia and clamp connections, which suggest a close relationship with Porpoloma s.st r. ( Horak, 1971). However, the lignicolous habitat is not consistent with placement in Dennisiomyces or Porpoloma. An ITS sequence (JQ694106) is publically available from a collection (PDD 87446) referred to as Pleurella ardesiaca from New Zealand. BLASTn results suggest the nearest alliance of this specimen to Baeospora in the Marasmioid clade (Matheny & al., 2006) or to Hypsizygus (Gillet) Singer in the Lyophyllaceae. A thorough analysis of the type is required to conf irm its taxonomic and phylogenetic position.

Phylogenetic analyses of the Tricholomatoid dataset recover a robust grouping (99% BS, 1.00 PP) composed of six major subgroups that share a most recent common ancestor with the genus Tricholoma. We recognize this group as the Tricholomataceae s.str. with the following genera: (1) Dennisiomyces (type: D. glabrescentipes Singer), (2) Porpoloma s.str. (type: Por. sejunctum), (3) Corneriella gen. nov. (type: Co. bambusarum), (4) Albomagister gen. nov. (type: A. subaustralis), (5) Tricholoma (type: T. flavovirens (Pers.: Fr.) S.Lundell), and (6) Pseudotricholoma stat. nov. (type: Ps. umbrosum) (7) Leucopaxillus (type: L. paradoxus (Costantin & L.M.Dufour) Boursier).