Lichenopeltella sp. P4998  

Mycelium inconspicuous, the ascomata possibly developing from intracellular haustoria.
Anamorph: not known.
Teleomorph: ascomata thyriothecia, 50-80 µm diam., round, in clusters on the host surface. Upper wall composed of dark chestnut-brown quadrilateral cells 2.5-3 µm long and broad, strongly radiate, those at the edge longer (to ca 6 µm). Basal plate paler brown, but of similar construction, cells ca 2 x 6 µm in size. Ostiolar collar to ca 20 µm diam, the basal ring composed of cells which appear to be perforated, surmounted by 2-3 rings of smaller dark brown thick-walled ± globose cells 2-2.5 µm diam.; setae not seen. Ostiole ca 6 µm diam., closed by a few thin-walled pale brown polygonal cells. Interascal tissue not seen. Asci 15-20 x 12-14 µm, saccate to obclavate, ± sessile, fissitunicate, at least mostly 8-spored. Ascospores 7.8-9.8 x 2.2-2.9 µm, narrowly clavate-ellipsoidal, slightly contricted at the slightly submedian septum, hyaline, cilia not seen.

Referred to as Lichenopeltella alpestris following Racovitza (1959, as Trichothyrium alpestre (Sacc.) Theissen), but that species has much larger thyriothecia, larger asci and ascospores, and conspicuous surface mycelium.