Lecidea commaculans Nyl.

Flora, 51: 476, 1868.
Synonyms: Lecidea intercalanda Arnold; Lecidea polycocca Sommerf.
Distribution: N - TAA, Piem (Matteucci & al. 2013, Giordani & al. 2014).
Description: Thallus crustose, poorly developed and mostly endosubstratic, sometimes thinly episubstratic and of scattered, whitish grey areoles. Medullary hyphae I-. Apothecia lecideine, black, (0.2-)0.4-0.8(-1.3) mm across, not or only slightly constricted at base, often clustered, with a strongly convex disc and a very thin, soon excluded proper margin. Proper exciple poorly developed, very thin, greenish black to blue-black in outer part, more or less colourless within; epithecium olive-green to greenish black; hymenium colourless to brownish or reddish, 30-60 µm high, not well delimited from the hypothecium; paraphyses richly branched and anastomosing, with a thick gelatinous sheath, the apical cell to 6 µm wide, with a dark cap; hypothecium reddish brown to purplish red, K+ bright purple. Asci 8-spored, distinctly thickened at the apex, with a I+ blue tholus, the outer gelatinous coat I+ pale blue, approaching the Bacidia-type. Ascospores 1-celled to indistinctly 1-septate, hyaline, narrowly ellipsoid to almost dumbbell-shaped, 7-10(-12) x (2-)2.5-3.5 µm. Conidia bacilliform, 6-8 µm long. Photobiont chlorococcoid. Spot tests: thallus K-, C-, KC-, P-, UV-. Chemistry: thallus without lichen substances.
Note: an arctic-alpine species of humid siliceous rocks near and above treeline; probably more widespread in the Alps. It does not belong to Lecidea s.str.
Growth form: Crustose
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

Alpine belt: rare
Subalpine belt: extremely rare
Oromediterranean belt: absent
Montane belt: absent
Submediterranean belt: absent
Padanian area: absent
Humid submediterranean belt: absent
Humid mediterranean belt: absent
Dry mediterranean belt: absent

pH of the substrata:

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Solar irradiation:

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Aridity:

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Eutrophication:

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Poleotolerance:

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Altitudinal distribution:

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Predictive model