Andreev, MP, Bredkina, LI, Golubkova, NS, Dobrysh, AA, Kotlov, YuV, Makarova, II, Urbanavichene, IN, & Urbanavichus GP. Handbook of the Lichens of Russia. 8. Bacidaceae, Catillaraceae, Lecanoraceae, Megalariaceae, Mycobilimbiaceae, Rhizocarpaceae, Tr
Thallus thinly crustose, often developing only in the recesses of mountain rocks, 0.1-0.8mm in thickness, dirty white, matte, fissured and developing uneven areoles. Areoles small, 0.2-0.5 mm in diameter, convex. Hypothallus inconspicuous.
Apothecia 0.2-0.9 mm in diameter, often in groups, seated on tapering bases, strongly convex, black to brown-black in color, matte to lustrous, with edges only apparent in young apothecia. Epithecium is grayish-bluish-greenish, 12-20 μm in height. Hymenial layer is colorless, 50-70 μm in height. Hymenium is colorless, 50- 130 μm in height. Exciple (the protective formation around the hymenial layer of the apothecia) is colorless on the inside, grayish-bluish-greenish on the edges. Paraphyses moderately flatly attached, free, rarely anastomosing, 1.7-3.5 μm thick, with apical cells thickening to 6 μm. Asci are clavate with a well pronounced tholus, 40–57 x 12–16 microns. The spores are narrow, ellipsoidal or elongate, often two-celled, with thin partitions and without a perispore.
The pycnidia are round and emergent. Conidia are threadlike, 12–25 x 0.8 microns.
The thallus K- to KC- or less often turns slightly yellow, C- and P-
Found on rocks composed of lime.
Not yet found in Russia. In Europe found in Spitsbergen, Germany, Switzerland, Austria, Italy, and Poland.
The systematic position of this taxon is unknown. Comparably thin walls of the asci, turning blue with I, sharply pointed apex of the body and