Biatorella fossarum  

Thallus crustose, thin, mid to dark grey, effuse and often ill-defined, lacking a layered structure, prothallus absent. Photobiont chlorococcoid.
Anamorph: not known.
Teleomorph: ascomata apothecia, 400-1000 µm diam., pale orange-red to greyish brown, sometimes yellowish brown when wet, shallowly convex to hemispherical. Thalline exciple absent. True exciple poorly developed, of ± parallel hyaline to pale yellow hyphae, J+ blue. Hymenium colourless or pale yellow, J+ deep blue. Hypothecium poorly developed, pale reddish brown. Interascal tissue with paraphyses 1.5-2 µm diam., sparsely branched and anastomosed below, becoming richly branched and swollen at the apex to 4-7 µm diam. Epithecium yellowish to reddish brown, K-. Asci multispored, cylindrical to clavate, apparently fissitunicate but without a tholus, with a gelatinous K/I+ intensely blue outer layer extending about one third the length of the ascus and a simple, K/I± blue apical dome. Ascospores 8-13 × 2.3-3 µm, cylindric-ellipsoidal, hyaline, aseptate, thin-walled, without a gelatinous sheath or appendages.
Chemistry: no lichen products detected by TLC.

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