Octospora musci-muralis

A muscicolous species fruiting in winter and parasitising Grimmia pulvinata, with sessile disc-shaped apothecia 2–4 mm in diameter, orange-yellow, and a slightly dentate margin of the same colour.

Subhymenium with hyphae of textura intricata, interwoven, 4–9 µm wide.

Ectal excipulum with hyphae of textura prismatica, 9–18 µm wide.

Asci clavate, 8-spored, operculate, measuring 160–200 µm long by 18–21 µm wide, with biseriate to irregular spore arrangement, basal croziers, inamyloid in Melzer's reagent.

Paraphyses filiform, simple or branched from the base, 4–5 µm wide, with apical swellings 7–9 µm wide filled with granular orange contents, projecting slightly above the asci.

Ascospores ellipsoidal to slightly oblong, hyaline, smooth- and thin-walled, measuring 20–25 µm long by 9.5–10.5 µm wide, containing one or two large oil guttules accompanied by smaller droplets inside.