Two new genera in the Phyllachoraceae : Sphaerodothella to accommodate Sphaerodothis danthoniae, and Parberya gen. nov.

Sphaerodothis danthoniae produces black tar spots on leaves and culms of Da nthonia spp. It is redescribed and illustrated in a new genus Sphaerodothel la. Sphaerodothella danthoniae differs from Sphaerodothis in having a perid ium composed of hyaline to brown, thin-walled, flattened fungal cells which merge with host cells, rather than a distinct stroma of melanised textura globosa, and pale brown ascospores which have a distinctive dark brown muci laginous perisporium. Parberya is described for a new species of tar spot f ungi, P. kosciuskoa, found on Danthonia pallida from Mt. Kosciusko, Austral ia, and to accommodate Sphaerodothis arxii P.F. Cannon on Pentameris sp. Pa rberya are typical phyllachoraceous tar spot fungi on grasses, which have d istinctive golden-brown ascospores ornamented with short, blunt spines. The previously undescribed andromorph of Parbelya arxii is also described.