Magnusson, AH. 1950. On Some Species of Blastenia and Caloplaca with Black Apothecia. Botaniska Nottser. 374-375.
The authentic specimen 2.5 X 2 cm large, effuse, verrucose-areolate, areolae very irregular in shape, about 0.5 mm diam., sometimes smaller or rarely up to 1 mm broad, 0.2-0.5 mm thick, sometimes granuliform, I-, KOH-, CaCl-, Pd-, pale grey-brown or sordid alutaceous, matt, convex, uneven or composed, without hypothallus.—Apothecia 0.4-0.5(0.6) mm wide, innate with the base or appressed, disc only slightly rising above the thallus surface, black, orbicular, naked with concolrous, very thin to excluded margin.
The tissue in the thallus dense, hyphose or cellular with 2-3 µ wide, globose, thin-walled cells. Algae often 14-17 µ diam., usually 8-10 µ.—Apothecia 0.13-0.5 mm thick, rather pale, with 0.2 mm thallus below, but no algae inside the apothecium. Exciple at edge 20-25 µ thick with exterior half caerulescent, entire, about 35 µ thick or +/- absent at centre, lower 8-12 µ caerulescent, the rest almost colourless with globose, about 2 µ large cells, the edge like partly also the base with radiating hyphae. Hypothecium 40-50 µ high with distinct lower limitation, variously +/- pale yellowish-brown. Thecium 50-55 µ high, I+ dark blue like hypothecium: upper 15-20 µ gradually caerulescent like exciple surface, both KOH+ darker blue-green without violet rose colour but becoming violet rose in HNO3, CaCl-, Pd-, hypothecium intensely fulvous in KOH. Paraphyses contiguous, 1.5-1.7 µ, simple, apices in KOH still contiguous, 4-5(6) µ thick, clavate.
Asci 35-40 X 12 µ. Spores 10-12(14) X 5-6(7) µ, septum 3-3.5 µ broad.
Pycnidia colourless (NYL.). Conidia 10-15 X 0.5-0.7 µ, very curved (figured by NYL.), acc. To TH. FR. (l.c.) 18-22 X 0.5 µ.
Russia. >>Lapp. or. Ad sinum Kolaënsem>>, 1861, N.J. FELLMAN (Herb. Mus. Fenn., Helsingfors) without accompanying species.Another specimen from Kola 1863 by FELLMAN is Bl. Atrocyanescens.—Finland.Recorded by RÄSÄNEN (Flecht. fl. Ostrob. bor.: 299, 1926) from Simo >>auf Grundsteinen des Kumioja>> with Lecanora lacustris and Placynthium pannariellum, but specimen not seen by me.