Buellia ectolechioides (Vain.) Erichsen

Verh. bot. Ver. Prov. Brandenb., 72: 45, 1930. Basionym: Melanaspicilia ectolechioides Vain. - Ark. Bot., 8, 4: 77, 1909
Description: Thallus crustose, episubstratic, whitish to pale grey, consisting of a few scattered areoles, usually delimited by a conspicuous, black, often fimbriate prothallus. Medulla white, I+ blue. Apothecia cryptolecanorine to zeorine, 0.3-0.4 mm across, black, immersed. Proper exciple poorly developed, aethalea-type, the inner hyphae narrow, hyaline, prosoplectenchymatous, the outer hyphae parallel, moderately swollen and usually strongly carbonized with brown and aeruginose pigments reacting N+ violet-red; epithecium brown to green, N+ violet-red; hymenium colourless, not inspersed with oil droplets, 60-80 μm high; hypothecium colourless to dark brown. Asci 8-spored, clavate, Bacidia-type. Ascospores 1-septate, slightly constricted at septum, brown, oblong-ellipsoid, 13-18 x 7-10 μm, Buellia-type, thin-walled throughout, with a microrugulate ornamentation. Photobiont chlorococcoid. Spot tests: thallus K- or K+ red (needle-like crystals), C-, KC-, P- or P+ faintly yellow, UV-. Chemistry: variable amounts of norstictic acid.
Note: on stones and low siliceous rocks near and above treeline; very closely related to B. leptolepis, based on a type from Northern Siberia and also reported from Carinthia (Austria), but perhaps much overlooked in the Alps; to be looked for in the Italian Alps.
Growth form: Crustose
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual

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Predictive model

United States National Herbarium - Smithsonian (US:Lichens) CC BY-NC 3.0 – Source: https://lichenportal.org/cnalh/collections/individual/index.php?occid=2795557