A coelomycet with conspicuous characteristics on fallen, dead leaves and twigs of Rosa
Rosa is a frequently plant host. My diagnosis passed off without result. Is this species apparently overlooked?
Habitat: Germany, Brandenburg, 03-2011.
Examination: rehydrated and examined in aqua dest., 05-2011, René K: Schumacher.
Pycnidia solitary in groups, sometimes confluent, apperently sessile, however the outer periderm of the host plant forming the peridium of the pycnidia, on the underside of leaves round to roundish and smooth, on twigs ellipsoid and finely striate, black, faintly shining, soft, convex when fresh, opening by 4-8 teeth to expose the mucigalinous, pale cream-pink-coloured disc, like a Coccomyces (!), peridium thick-walled, composed of 4 and more layers of polygonal cells, textura globulosa-angularis, internally hyaline, externally small-celled, yellowish-reddisch-black, 0,75-0,90 mm diam.
Conidiophors small and scarcely visible. Conidia numerous, not in chains, unicellular, navicular, both ends tapered to a point, curved, hyaline, smooth, thin-walled, eguttulat, mature 7,5-8,5 x 1,5-1,75 µm.