Myrmecridiaceae Crous, Persoonia 34: 219 (2015)
MycoBank number: MB 812461; Index Fungorum number: IF 812461; Facesoffungi number: FoF 06703; 16 species.
Saprobic on decaying wood submerged in freshwater, leaf litter, on stem or leaves of herbaceous plants, occurring on soil and in house dust (Crous et al. 2015b, c, 2016b, 2018b, c, Peintner et al. 2016, Réblová et al. 2016a, Tibpromma et al. 2017b). Sexual morph: Ascomata immersed, solitary or aggregated, with subglobose to conical venter and ostiolate papilla as well as dark brown clypeus, glabrous. Ostiole periphysate. Peridium leathery, two-layered with hyaline to pale brown outer layer and subhyaline inner layer consisting of cells of textura angularis to textura prismatica. Paraphyses cylindrical, septate. Asci 8-spored, unitunicate, cylindrical, with a slender long pedicel, apex rounded. Ascospores uniseriate or overlapping uniseriate, hyaline, ellipsoidal, 3- septate, slightly verrucose, with granular content (Réblová et al. 2016a). Asexual morph: In vitro, Mycelium submerged, hyaline, thin-walled. Conidiophores erect from creeping hyphae, unbranched, straight or flexuous, brown at base and paler towards the apex, subcylindrical, smooth, septate. Conidiogenous cells differentiating from the apical region of conidiophore, integrated, polyblastic, cylindrical, subhyaline to brown, with conidium-bearing denticles along the conidiogenous axis. Conidia hyaline to pale brown, ellipsoid to obovoid to fusoid, solitary, smooth or verrucose, aseptate or septate, some species present a wing-like sheath (adapted from Crous et al. 2015c, 2016a, 2018b, c, Peintner et al. 2016, Tibpromma et al. 2017b).
Type genus – Myrmecridium Arzanlou, W. Gams & Crous
Notes – Myrmecridiales and Myrmecridiaceae were established by Crous et al. (2015c) to accommodate Myrmecridium species based on the analyses of LSU sequence data. Myrmecridiaceae is the type family of Myrmecridiales (Sordariomycetes). Myrmecridiales is a monotypic order in the subclass Diaporthomycetidae (Crous et al. 2015c) and has phylogenetic affinities with Distoseptisporaceae and Magnaporthales in a multi-gene phylogenetic tree based on LSU, SSU, tef1 and rpb2 sequence data (Hongsanan et al. 2017). Myrmecridiaceae comprises two genera Myrmecridium (Arzanlou et al. 2007) and Neomyrmecridium (Crous et al. 2018b).