Lecanora bicinctoidea Blaha & Grube

Mycologia, 99, 1: 53, 2007
Description: Thallus crustose, episubstratic, cream-white to white, delimited by a black prothallus, the areoles small 0.4-0.8(-1) mm wide, flat to slightly convex, with sinuous margin and a smooth surface. Apothecia lecanorine, 0.7-1.3(-1.7) mm across, round, broadly sessile, with a blue-grey to bluish-pruinose, flat to slightly convex disc, an entire, slightly sinuous thalline margin, and a distinct, black parathecial ring. Thalline exciple eucorticate, with crystals; proper exciple thick, dark in outer and upper part, colourless within; epithecium dark olivaceous brown, with crystals dissolving in K; hymenium colourless, 60-90(-100) µm high; paraphyses sparingly branched, c. 2 µm thick at mid-level, the apical cells not or only slightly thickened, 2-3 µm wide; hypothecium colourless. Asci 8-spored, clavate, Lecanora-type. Ascospores 1-celled, hyaline, ellipsoid, 10.2-13(-15) x 5.7-7.5(-8) µm, thick-walled. Pycnidia with a dark brown to black ostiolar region. Conidia thread-like, (18-)25(-29) x c. 1 µm. Photobiont chlorococcoid. Spot tests: thallus K+ pale yellow, C-, KC-, P-; apothecial disc C+ yellow to orange, K-, P-. Chemistry: arthothelin, atranorin, chloroatranorin, eugenitol, isoarthothelin, methyl 3a-hydroxy-4-O-demethylbarbatate, psoromic acid (facultative), thiophanic acid (facultative); pruina of apothecia with sordidone (major). acid (facultative), thiophanic acid (facultative); pruina of apothecia with sordidone (major).
Note: on vertical to overhanging faces of siliceous cliffs; so far only reported from the Eastern Alps (Austria, Styria), but perhaps more widespread; to be looked for in the Italian Alps.
Growth form: Crustose
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
In underhangs rarely wetted by rain

pH of the substrata:


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Altitudinal distribution:


Predictive model

Source: Blaha & Grube, Mycologia, 99, 1: 53, 2007