Diademosa Shoemaker & C.E. Babc., Can. J. Bot. 70(8): 1641 (1992).

Saprobic on stems and wood. Sexual morph: Ascomata immersed, initially erumpent becoming superficial, scattered, depressed-globose, some flattened at the base, opening a disc-like lid of brown prismatic cells with setae. Peridium composed of brown pseudoparenchyma cells of textura angularis. Hamathecium  numerous, septate, hyaline, cellular pseudoparaphyses. Asci 8-spored, bitunicate, fissitunicate, clavate with short narrow pedicel and minute ocular chamber. Ascospores biseriate, partially overlapping, fusiform, straight, frequently circular in section but narrowing to one end, with transverse and vertical septa, pale brown to dark brown, smooth walled. Asexual morph: unknown.

 Type Species: Diademosa californiana (M.E. Barr) Shoemaker & C.E. Babc. [as ‘californianum’], Can. J. Bot. 70(8): 1641 (1992).