Obryzum Wallr., Naturgesch. Flecht. 1: 253 (1825)
Sordariomycetes families incertae sedis, Obryzaceae, Obryzum
Index Fungorum number: IF3537; 3 morphological species
Mainly lichenicolous with green algae on rocks or bark and seldom on mosses. Sexual morph: Ascomata perithecial, pyriform, astromatic, immersed. Ostiole periphysate. Peridium hyaline with ostiolar region appearing light brown at times. 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. Asexual morph: Undetermined (adapted from Cannon & Kirk 2007, Maharachchikumbura et al. 2016).
Type species: Obryzum corniculatum (Hoffm.) Wallr., Naturgesch. Flecht. 1: 253 (1825)
Notes: Species of this genus have been reported to be derived mainly from temperate areas and observed to be occasionally parasitic on cyanobacterial lichens of Leptogium genus. At first, Obryzum corniculatum was Collema corniculatum. However, after it had been considered improper to give the lichenicolous fungus similar name as its host, Collema corniculatum, the generic name was changed to Obryzum (Lücking et al. 2017). Given the fact that Obryzum was at first mistakenly introduced as generic name for a presumed pyrenocarpous gelatinous lichen (Wallroth 1825), neither C. corniculatum nor Obryzum can be lectotypified on the lichenicolous fungus (Lücking et al. 2017). In this case, a conservation proposal is essential if O. corniculatum and Obryzum are to be maintained in their currently used sense (Lücking et al. 2017). Obryzum is now maintained in the Pezizomycotina, genera incertae sedis and is still a poorly studied genus with insufficient molecular data (Lücking et al. 2017).