in Savic & Tibell, Nord. J. Bot., 26: 244, 2008. Basionym: Verrucaria theleodes Sommerf. Suppl. Fl. Lapp.: 140 - 1826.
Synonyms: Henrica ramulosa B. de Lesd.
Distribution: N - TAA, Lomb, Piem, VA (Piervittori & Isocrono 1999).
Description: Thallus crustose to minutely subsquamulose, episubstratic, pale grey to fawn, matt, at first consisting of scattered, convex granules, later forming 0.7-3 mm wide, confluent or scattered, flattened areoles with subcrenulate margins, the basal part sometimes extending to a short, black stalk. Thallus pseudoparenchymatous throughout, the outermost layer forming a 18-29 µm thick, colourless pseudocortex of spherical cells, with aggregates of vacuolized cells forming irregular, pruina-like projections; algal cells distinctly arranged in vertical columns separated by vertical strands of mycobiont cells; lower side and stalk of peltate areoles with a dark brown, pseudoparenchymatous cortex. Perithecia black, rather smooth, 0.6-0.8 mm across, hemispherical, emerging or immersed in the areoles, with only the ostiole exposed. Involucrellum well-developed apically, c. 110-130 µm thick in upper part, carbonized and fused with the exciple, diverging from exciple at half the height of the perithecium; exciple 29-36 µm thick, brown but very pale at base; hamathecium of periphyses and numerous, short, c. 1 µm wide, branched and anastomosing pseudoparaphyses, the latter covering the inner perithecium wall halfway down; hymenial gel I+red, K/I+blue. Asci 8-spored, clavate, without apical thickening when mature. Ascospores muriform, brown, ellipsoid or narrowly ellipsoid, 53-69 x 26-32 µm, often slightly curved. Photobiont chlorococcoid. Spot tests: K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: in niches and fissures of humid calcareous schists and granodiorite, usually along rivers or by lakeshores, often occurring together with cyanobacterial lichens, usually above treeline; known from Scandinavia, Iceland, Greenland, the Alps and the Pyrenees, and from Colorado in North America.
Natural History Museum (2014). Dataset: Collection specimens. Resource: Specimens. Natural History Museum Data Portal (data.nhm.ac.uk). https://doi.org/10.5519/0002965 Retrieved: 14:36 19 Dec 2021 (GMT)
Source: Zschacke, H. (1934) Epigloeaceae, Verrucariaceae und Dermatocarpaceae. In: Dr. L. Rabenhorst‘s Kryptogamen-Flora, Band 9, Abt. 1, Teil 1. Akademische Verlagsgesellschaft, Leipzig, 695 pp. - Public Domain