Requienellaceae Boise, Mycologia 78(1): 37 (1986)
Index Fungorum number: IF 81336; MycoBank number: MB 81336; Facesoffungi number: FoF 06879; 13 species.
Saprobic on dead wood or pathogenic on plants. Sexual morph: Ascomata immersed or erumpent, globose to subglobose base with prominent apex, solitary or aggregated, perithecioid, sometimes whitish, greyish to black at the margin. Ostiole inconspicuous or strongly erumpent, flattened or papillate to conical, black. Peridium comprises thick-walled angular cells, thickened in upper regions. Paraphyses numerous, apically free, aseptate, curved, scarcely branched. Asci 8- spored, unitunicate, cylindrical, subfusiform to narrowly clavate, with thick-walled apex, wide ocular chamber comprising a slightly refractive, inversely funnel-shaped dome, turning slightly reddish in Congo Red. Ascospores uni – to biseriate, olivaceous or brown, ellipsoid to oblong, with round or acute ends, with one or several transverse distosepta and large lumina. Asexual morph: Undetermined (adapted from Jaklitsch et al. 2016b).
Type genus – Requienella Fabre.
Notes – Requienellaceae has historically been treated in Melanommatales (Barr 1990a) based on its trabeculate-like paraphyses (Liew et al. 2000). Aptroot (1991) followed this and added more lichenised taxa to the non-lichenised Requienella. Jaklitsch et al. (2016b) determined Requienellaceae as a distinct family in Xylariales based on the DNA-based sequence analyses of its generic type. Phylogenetically this family is a strongly supported monophyletic lineage sister to the taxa in Cainiaceae (Jaklitsch et al. 2016b). Currently, the family comprises four genera viz. Acrocordiella (Jaklitsch et al. 2016b), Lacrymospora, Parapyrenis and Requienella (Wijayawardene et al. 2018a).