Lecanora freyi Poelt

Mitt. bot. Staatss. München, 19-20: 464, 1958.
Description: Thallus crustose-placodioid, episubstratic, rather thin, closely adpressed, white to yellowish white, forming orbicular to irregular rosettes up to 1 cm in diam. Central parts of thallus rimose-areolate, marginal lobes contiguous, concave to flat, 2-3 x 0.5-1 mm, often with a darker margin. Cortex 50-70 µm thick, rich in crystals. Apothecia lecanorine, adnate to sessile, with a flat to convex, at first pale brown but soon dark green to blackish green disc, and a thick, often wavy or crenulate thalline margin level with disc, which may be excluded in old apothecia. Epithecium blue-green to greenish, coarsely granulose, K+ dark green in specimens with dark apothecial discs; hymenium colourless, 60-70 µm high; paraphyses slightly swollen at apex; hypothecium colourless. Asci 8-spored, clavate, very thin-walled, with a K/I+ blue, tall tholus penetrated by a faintly amyloid apical cushion, the wall K/I-, surrounded by a blue outer layer, Lecanora-type. Ascospores 1-celled, hyaline, ellipsoid, 8-11.5 x 4-6 µm. Photobiont chlorococcoid. Spot tests: thallus K-, C-, KC-, P-. Chemistry: without lichen substances.
Note: on steep faces of calcareous schists at high elevations; widespread in the eastern Alps outside the Italian territory, but altogether rare; to be looked for in the Italian Alps.
Growth form: Crustose placodiomorph
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual

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Predictive model

https://zenodo.org/record/1485664#.X3cyRHVS-Uk - CC0 1.0 Universal Lich. Alpium 73 - Isotype