Eudimeriolum Speg., Anal. Mus. nac. Hist. nat. B. Aires 23: 36 (1912).
Index Fungorum number: IF 1922; Facesoffungi number: FoF 07905, 16 morphological species (Species Fungorum 2021), molecular data unavailable.
Saprobic on dead leaves. Sexual morph: Ascomata superficial, solitary, irregularly, dehiscent, globose to subglobose, membranaceous, with coarse context, parenchymatous, olivaceous. Asci 8- spored, bitunicate, cylindrical to clavate, narrow towards the base, short pedicellate, apex rounded, with filiform pseudoparaphyses. Ascospores 1–2-seriate, fusoid to subclavate, upper cell wider, basal cell with acute base, 1-septate, hyaline when immature, becoming pale green when mature. Asexual morph: Undetermined. (Adapted from Boonmee et al. 2017).
Type species: Eudimeriolum elegans Speg.
Notes: Eudimeriolum was introduced by Spegazzini (1912) with E. elegans as type species. Eudimeriolum is characterized by superficial ascomata, sphaerical, membranaceous, olivaceous, 8-spored asci and 1-septate and hyaline ascospores. Hansford (1946) placed Eudimeriolum in Sphaeriaceae based on the glabrous ascomata lacking an appendaged mycelia. von Arx and Müller (1975) transferred Eudimeriolum to Dimeriaceae based on the saprobic lifestyle, primarily growing on leaves, superficial mycelium and glabrous ascomata. Barr (1997) revised numerous dimeriaceous taxa and transferred Eudimeriolum to the family Pseudoperisporiaceae. Boonmee et al. (2017) re-studied Eudimeriolum and accepted this genus in Pseudoperisporiaceae based on its parasitic and saprobic habit on leaves. Currently, Eudimeriolum is a distinct genus in Pseudoperisporiaceae. Fresh collections and molecular data are needed to confirm the taxonomic placement of Eudimeriolum.