Protothelenella corrosa (Körb.) H. Mayrhofer & Poelt

Herzogia, 7: 42, 1985. Basionym: Limboria corrosa Körb. - Syst. Lich. Germ.: 376, 1855.
Synonyms: Acrorixis corrosa (Körb.) Trevis.; Microglaena corrosa (Körb.) Arnold; Microglaena gibbosula (Nyl.) Blomb. & Forssell; Microglaena nericiensis Hellb.; Polyblastia arenaria (Hampe) Jatta; Thelenella corrosa (Körb.) Vain.
Distribution: N - TAA (Ohmura & Mayrhofer 2016, Nascimbene & al. 2022), Lomb (Pistocchi & al. 2026), Piem (Isocrono & al. 2004).
Description: Thallus crustose, smooth to granular-uneven, warted, or forming a cracked crust, often consisting of dispersed areoles surrounding the perithecia, whitish, dirty yellowish or brownish white, bright green when wet, sometimes poorly evident. Perithecia 0.2-0.5 mm across, scattered, partly immersed, forming low to prominent, black projections, the apex often with a small central depression. Exciple dull greenish brown to dark brown in upper part, colourless to very pale brown towards the base, of strongly anastomosing, up to 1 μm wide, conglutinate hyphae with narrow lumina; paraphysoids thread-like, c. 1 μm thick, persistent, strongly branched and anastomosing; periphysoids absent; hymenial gel I+ reddish or I+ blue at low concentrations, K/I+ blue. Asci 8-spored, cylindrical, short-stalked, thick-walled (2-3 μm), fissitunicate, the outer gelatinous wall layer I+ blue, with a very faintly I+ blue apical plug. Ascospores muriform, hyaline, broadly ellipsoid to ovoid, (16-)18-32 x (8-)10-15(-18) μm, the outer wall distinctly thicker than the septa. Photobiont chlorococcoid (Elliptochloris), the algal cells surrounded by a gelatinous sheath. Spot tests: thallus K-, C- or C+ red, KC- or KC+ red, P-. Chemistry: an unidentified C+ red pigment in thallus.
Note: an subarctic-boreal, perhaps circumpolar lichen found on various types of siliceous rocks such as quartzite, granite, gneiss, schists, sandstone, vulcanites, including rocks with low content in calcium, especially by creeks and lakes, on boulders and pebbles near the ground; much overlooked and certainly more widespread in the Alps, with optimum from the montane to the lower alpine belt.
Growth form: Crustose
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
Most common in areas with a humid-warm climate (e.g. most of Tyrrenian Italy)

Commonnes-rarity: (info)

Alpine belt: very rare
Subalpine belt: rare
Oromediterranean belt: absent
Montane belt: very rare
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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Eutrophication:

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Poleotolerance:

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Predictive model
Herbarium samples
INDEX FUNGORUM GBIF DOLICHENS

Troy McMullin CC BY-SA 3.0 – Source: https://lichenportal.org/cnalh/taxa/index.php?taxon=52356&clid=1231
Canada, Quebec, Gaspè Peninsula
TSB 32749


Zschacke, H. (1934) Epigloeaceae, Verrucariaceae und Dermatocarpaceae. In: Dr. L. Rabenhorst‘s Kryptogamen-Flora, Band 9, Abt. 1, Teil 1. Akademische Verlagsgesellschaft, Leipzig, 695 pp. - Public Domain