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
The thallus is uniform, moderately to fairly thick, up to 0.5 mm in thickness, areolate. The areolae are matte, whitish, 0.5 – 1.5 mm in diameter, occasionally touching each other, occasionally sessile, lossely or fairly tightly attached, convex or flat, usually with a flat, smooth surface. The hypothallus is barely noticeable.
The apothecia are 0.3 – 0.6 mm in diameter, narrowing to the base, arranged on the thallus in groups. The disk of the apothecium is black, naked, matte, flat to slightly convex, thinning uniformly or strongly to the edge. The epithecium is reddish-sooty. The hymenium is 70-100 μm in height. The paraphyses are in contact for a fairly large extent, but not completely connected, 1.5 μm in thickness, on the top they are clavate. The hymenium is brownish red-black. The asci are broadly clavate, with 8 spores, aligned in 2 rows. The spores of the Buellia-type are 2-celled, in the beginning uncolored, and then brownish, ellipsoidal or elongated, with evenly and moderately thickened cell walls, not sessile near the septa, 12–21 X 6–8 μm.
The pycnidia are regular, submerged, brownish red-sooty. The conidiophores are composed of few cells, conical, unbranched, 4-6 μm in length, on the top with the conidia. The conidia are straight, rodlike, on the top they are rounded or blunt, 5 x 1 μm.
The thallus turns yellow from K, but red crystals do not form, from C it does not change in coloration. The exciple, epithecium, and hymenium do not change in coloration from K and/or N. The hymenial layer turns dark blue from I.
On the rocks – gneiss and granites.
Arctic (Chukotka) – Europe, Asia. Rare species.
This species is close to Buellia concinna and B. stellulata. It is different from B. concinna in color and the reaction of the thallus, and also in that the apothecia stay flat longer. B. cocinna's thallus has a yellowish tint, does not change in coloration from K, and turns orange from C. It is different from B. stellulata in the arrangement of the apothecia, the size of the spores, and the reaction of the epithecium to N. The apothecia of B. stellulata are arranged along the edges and between the areolae, the spores are shorter , 8–15 X5–8 μm. The epithecium turns rose from N.