Verrucaria glaucodes Nyl.

Flora, 55: 362, 1872.
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Distribution:
Description: Thallus crustose, thinly episubstratic, pale green, pale blue-green or pale brownish green, continuous or partially finely rimose, especially near the perithecia. Perithecia black, half-immersed in the thallus, forming 0.2.0.3 mm wide projections, the base not immersed in the rock. Involucrellum thick, limited to upper third of the perithecium, appressed to exciple; exciple colourless; hamathecium of periphysoids, interascal filaments absent; hymenial gel hemiamyloid, I+ red (I+ blue at very low concentrations of I), K/I+ blue. Asci 8-spored, clavate, I-, fissitunicate, the wall thickened above, with an ocular chamber, dehiscent by extrusion of an endotunica to form a delicate rostrum, Verrucaria-type. Ascospores 1-celled, hyaline, ellipsoid, 13-17.5 x 6-8 µm. Photobiont chlorococcoid. Spot tests: K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: a rather poorly known species growing on calciferous, often dolomitic rocks, on steeply inclined surfaces, sometimes beneath overhangs, in shaded-humid situations at low altitudes. According to Roux & Coll. (2025), the species, which is known from Southern France and the Basque Country, could belong to Parabagliettoa.
Growth form: Crustose
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual

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Predictive model

Serge Poumarat - Source: http://mycologie.catalogne.free.fr/lichenPhoto2021/Verrucaria_glaucodes_2.jpg
France, Var


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