Argynnaceae Shearer & J.L. Crane, Trans. Br. mycol. Soc. 75(2): 193 (1980).

MycoBank number: MB 80470; Index Fungorum: IF 80470; Facesoffungi numbers: FoF 06386, 3 species.

Saprobic on plant stems or wood and in freshwater and terrestrial habitats. Sexual morph: Ascomata apothecial or perithecial, solitary, superficial to slightly immersed, discoid, dark brown to black, coriaceous, lacking ostioles, lacking a stipe. Excipulum thick, ectal excipulum composed of brown to dark brown tissues mixed with host cells, medullary excipulum composed of hyaline cells of textura porrecta. Hymenium composed of wide, septate, branching, hyaline, cellular pseudoparaphyses. Epithecium lacking. Asci 8-spored, bitunicate, fissitunicate, clavate, globose to subglobose, pedicellate, thick-walled, lacking an ocular chamber, exposed or not. Ascospores 2–3-seriate, or multi-seriate, papilionaceous to broadly reniform, light brown, orange to light orange-brown, 1-septate, smooth-walled, 2- to multiguttulate, with a dark band at the septum. Asexual morph: Undetermined.

Type: Argynna Morgan.

Notes: Argynnaceae was introduced to accommodate two genera of Argynna and Lepidopterella (Hyde et al. 2013; Kirk et al. 2013; Wijayawardene et al. 2018). The species in Argynnaceae are saprobes and occurring on stems, twigs and woody debris from dicotyledonous and monocotyledonous plants. Additional collections and molecular study are required to clarify the phylogeny of this family.