Sistotremastraceae – Facesoffungi number: FoF 12856

Sistotremastraceae L.W. Zhou & S.L. Liu.

MycoBank number: MB 559876; Index Fungorum number: IF 559876; Facesoffungi number: FoF 12856;

Description

Basidiomes resupinate, effused, thin, usually up to 100 μm thick. Hymenophore smooth, grandinioid or odontioid, white to pale ochraceous. Hyphal system monomitic, all septa with clamp connections. Cystidia mostly absent, hyphidia rarely present. Basidia cylindrical to tubular, often with a slight median constriction, with four to eight sterigmata. Basidiospores smooth, ellipsoid to cylindrical, inamyloid, acyanophilous. On wood.

Type genus: Sistotremastrum J. Erikss., Symb. bot. upsal. 16(no. 1): 62 (1958).

Notes: Sistotremastraceae is the single family within Sistotremastrales and comprises Sertulicium and Sistotremastrum, segregated from Trechisporales. Therefore, the unique morphological characters of Sistotremastraceae are the same as those indicated to Sistotremastrales above. From the morphological perspective, Larsson (2007) suggested the distinction of Sistotremastrum from other genera in Trechisporales and used the designation ‘Sistotremastrum family’. Spirin et al. (2021) segregated Sertulicium from Sistotremastrum and indicated these two genera are unique in Trechisporales. However, Spirin et al. (2021) did not propose any formal taxonomic change at the family or higher rank mainly due to lack of reliable phylogenetic support. Here, according to multilocus-based phylogenetic analyses, we formally propose Sertulicium and Sistotremastrum in one new family and one new order independent from Hydnodontaceae and Trechisporales, respectively.

Updated genera list

Sertulicium Spirin, Volobuev & K.H. Larss., in Spirin, Volobuev, Viner, Miettinen, Vlasák, Schoutteten, Motato-Vásquez, Kotiranta & Larsson, Mycol. Progr. 20(4): 460 (2021).

Sistotremastrum J. Erikss., Symb. bot. upsal. 16(no. 1): 62 (1958).

Genera