Cocconia Sacc., Syll. Fung. (Abellini) 8: 738 (1889), Index Fungorum number: IF 1149
Saprobic on leaves. Sexual morph: Ascostromata solitary to gregarious, or in groups, superficial, shield-like, dark brown to black, carbonaceous, flattened, connected to internal stroma by hyphal tubes or clusters. Ascomata margin smooth, internal stroma easily distinguished, well-developed, with ridges radiating from the centre to the outer rim, ridges containing elongate locules, which open by a longitudinal slit and contain numerous asci, cells of ascostromata thick-walled, elongate and composed of black, amorphous tissues in the stromatic crust. Hamathecium of dark brown to hyaline, septate pseudoparaphyses, swollen and brown at their apices. Asci 8-spored, thick-walled, bitunicate, cylindrical, short-pedicellate, with a distinct ocular chamber. Ascospores 2–3-seriate, ellipsoidal, with rounded ends, hyaline to dark brown, 1-septate, constricted at the septum, smooth walled (Hyde et al. 2013).
Type species: Cocconia placenta (Berk. & Broome) Sacc.
Notes: Sections of fruit-bodies of the type specimens of Cocconia palmae F. Stevens (Stevens 1927), current name Dianesea palmae revealed two different taxa and Imicio & Cannon (2002) stated it was clear that the original description was a composite of both species. Hence, in this study we re-examined the morphology of both Cocconia placenta under Cocconia and Cocconia palmae under Dianesea. We have provided only a single description as this genus contains a single species with two varieties.