Distribution: N - Frl (TSB 26042), Ven (Thor & Nascimbene 2007).
Description: Thallus crustose, episubstratic, grey-green, diffuse, often forming a collar surrounding each perithecium, consisting of granular, goniocyst-like units; soralia scattered, diffuse, concolorous with thallus; soredia 20-40 μm across, often with projecting, colourless hyphae. Perithecia black, 0.2-0.4 mm across, one-quarter to three-quarters immersed in thallus. Excipulum reddish brown but irregularly pigmented; involucrellum absent. Hamathecium of periphyses, interascal filaments absent; hymenial gel I+ red (I+ yellowish or blue at low concentrations of I), K/I+ blue. Asci 8-spored, clavate, the wall thickened in upper part, K/I-. Ascospores (5-)7-septate, hyaline, ellipsoid-fusiform, 25-35(-45) x 6-9 μm. Photobiont chlorococcoid. Spot tests: all negative. Chemistry: without lichen substances.
Note: a mild-temperate lichen, most often found on trees with subacid to base-rich bark, often on mosses; to be looked for further in Italy. It is included in the Italian red list of epiphytic lichens as “Data Deficient” (Nascimbene & al. 2013c).
Growth form: Squamulose
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
Most common in areas with a humid-warm climate (e.g. most of Tyrrenian Italy)