Myriolecis torrida (Vain.) Śliwa, Zhao Xin & Lumbsch

in Zhao & al., Fungal Diversity, 78, 1: 301, 2015 Basionym: . Basionym: Lecanora torrida Vain. - Ark. Bot., 8, 4: 45, 1909
Description: Thallus crustose, episubstratic, white, sometimes distinctly areolate and forming up to 1 cm wide patches, sometimes reduced to small areoles around the apothecia, the areoles rather thick, usually slightly convex, very irregular in outline. Cortex c. 60 μm thick, of anticlinally arranged hyphae, filled with anticlinally arranged stripes of crystals. Apothecia lecanorine, broadly sessile, not or only slightly constricted at base, round to irregular in outline, mostly 0.5-0.8 mm across, with a concave to flat, rarely slightly convex, dark brown to blackish disc, the thalline margin initially raised, sometimes finally excluded, white but often bluish in inner part. Thalline exciple corticate, the cortex c. 100 μm thick at base, much thinner laterally, filled with crystals; proper exciple colourless or bluish in outer part; epithecium brown, filled with brownish crystals insoluble in K and N; hymenium colourless, c. 80 μm high, with numerous colourless crystals insoluble in K and N; paraphyses simple or branched in upper part, the apical cells swollen, up to 6 μm wide, with a brown to bluish (near the exciple) cap; hypothecium colourless, more or less conical. Asci (4-)8-spored, clavate, Lecanora-type. Ascospores 1-celled, hyaline, ellipsoid, 9-13 x 5-6 μm. Photobiont chlorococcoid. Spot tests: K-, C-, KC-, P-, UV-. Chemistry: without lichen substances, or with low amounts of 2,7-dichlorlichexanthone and pannarin.
Note: on more or less calcareous rocks; widespread and known from both Hemispheres, with a few records from the Eastern Alps (Austria), but probably still overlooked elsewhere. To be looked for in Italy.
Growth form: Crustose
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual

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Predictive model