Obryzum is a fungal genus in the monotypic family Obryzaceae, in the class Sordariomycetes.
[3][4] The genus name of Obryzum is derived from the Ancient Greek word ὄβρυζον meaning pure gold.
[5][6] The genus is mainly lichenicolous but with green algae on rocks or tree bark and seldom on mosses.
Asci 4-8-spored, unitunicate, clavate, closely ellipsoid to ovoid, short-pedicellate, with barely visible apical ring, deliquescent at the base.
Ascospores overlapping 1–2-seriate, hyaline, aseptate, smooth-walled, fusiform to limoniform or ellipsoid, lacking any mucilaginous sheath or appendage.