Apiosporopsidaceae Senan., Maharachch. & K.D. Hyde, Stud. Mycol. 86: 234 (2017)

Index Fungorum number: IF821538; 3 species

Parasitic on living leaves and twigs. Sexual morph Ascomata scattered, black, oval to almost spherical, immersed in the leaf tissue beneath a thin, well-developed clypeus, neck lacking or only slightly papillate, periphysate. Peridium comprises 5–6 outer layers of dark, thick-walled cells of textura angularis and inner, thin-walled, strongly flattened cells of textura angularis. Hamathecium aparaphysate. Asci 8-spored, unitunicate, short-pedicellate, apex blunt with J- apical ring. Ascospores 1–2-seriate, elliptical to fusoid, often slightly flattened on one side, unicellular, hyaline. Asexual morph Coelomycetous. Stroma loculate, globose to irregular, sometimes with beaks. Conidiogenous cells phialidic, short to elongate, simple or branched. Conidia oblong or cylindrical to allantoid, 1-celled, hyaline.

Type genus: Apiosporopsis (Traverso) Mariani.

Notes – Apiosporopsidaceae was introduced by Senanayake et al. (2017a) to accommodate Apiosporopsis species which are morphologically distinct from other families in Diaporthales. The asci initially form a hymenium-like fascicle within papillate ascomata, asci have a bilobed apical ring and residual stromatic tissue is present within the locules. This family is supported by molecular data (Braun et al. 2018, Fan et al. 2018, Senanayake et al. 2017a, 2018, Tian et al. 2018).

Ecological and economic significance of Apiosporopsidaceae
Apiosporopsis species are generally associated with over-wintered plant parts as epifoliar fungi and rarely on living leaves (Barr 1978, Reid & Dowsett 1990). Apiosporopsis species are considered saprobes or mild pathogens (Senanayake et al. 2018).