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 Add this item to the list   828560 Original description
   
Description type:Original description 
Description:Ascomata apothecioid, dispersed on upper side of healthy thallus of the host (occasionally causing slight hypertrophy), emarginate, immersed at first, soon sessile with slightly constricted base, moderately to strongly convex, rounded in shape, (0.1–)0.2–0.4(–0.5) mm in diam. Disc pale to dark gray or almost black, matte, usually strongly greyish pruinose. Margin not evident from the beginning, concolorous with the disc. Exciple laterally 30–60 μm wide, basally 40–50 μm, colourless inside, not inspersed by crystals or oil droplets, I–, composed of strongly gelatinized, radiating hyphae with lumina 1–2.5 μm wide, sometimes apically slightly widened to 3.5 μm. Epihymenium pale to dark grey pigmented, K+ orange-brown, N–, 5–10 μm thick, strongly inspersed by small hyaline or yellowish crystals (K+ dissolving, N–). Hymenium colourless to greyish blue (with less amount of the same pigment as in epithecium), not inspersed by oil droplets, 50–70(–80) μm high, strongly conglutinate, I+ blue, K/I+ blue. Paraphyses colourless, branched and anastomosed, composed of highly gelatinized hyphae with lumina 1–2 μm wide, sometimes apically thickened (to 4.5 μm wide) and with pigmented caps. Subhymenium greyish to dark brown, not clear c. 5–10 μm high. Hypothecium dark brown to grey brown pigmented, K+ yellow to orange brown, N+ reddish brown, composed of intricately arranged hyphae with lumina 2–3 μm wide, 40–100 μm high. Asci 8-spored, clavate, with K/I+ blue tholus resembling the transitional stage between Lecanora- and Micarea-type (according Haffelner 1984), 50–70 × 10–15 μm. Ascospores colourless, 1-septate to rarely simple, ellipsoid, sometimes slightly curved, with round ends, without epispore, (10–)10.6–14.5–16.5(–22) × (3–)3.8–4.2–4.6(–5) μm, l/b ratio (2.1–)2.9–3.5–4.2(–5.7) μm (n=310). Conidiomata not seen. 
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