Thelidium submethorium (Vain.) Zschacke

Hedwigia, 62: 140, 1920. Basionym: Verrucaria aeneovinosa subsp. submethoria Vain. - Meddeland. Soc. Fauna Fl. Fenn., 19: 170, 1883.
Synonyms:
Distribution: N - TAA (Thüs & Nascimbene 2008, Nascimbene & al. 2022).
Description: Thallus crustose, episubstratic, olive-brown to brown-grey, thin to thick (10-130 μm), continuous to finely rimose, paraplectenchymatous, more or less subgelatinous and with transparent margins when wet. Perithecia black, prominent, 0.15-0.3 mm across. Involucrellum variable, even within a single thallus. from apical and adpressed to exciple to spreading and reaching the thallus base, moderately thick (<90 μm in upper third), 250-510 μm in diam; hamathecium of periphyses and periphysoids, interascal filaments absent; periphyses up to 30 μm long. Asci 8-spored, ellipsoid to clavate, I-, fissitunicate, the wall thickened above, with an ocular chamber, dehiscent by extrusion of a delicate rostrum. Ascospores (0-)1-septate, hyaline, ellipsoid, 26-39 x 9-18 μm, without perispore. Photobiont chlorococcoid. Spot tests: K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: a rare species of siliceous substrata in clean creeks and rivers of high mountain ranges, with optimum above treeline.
Growth form: Crustose
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
Periodically submerged (e.g. in creeks)

Commonnes-rarity: (info)

Alpine belt: very rare
Subalpine belt: absent
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
Herbarium samples
Index Fungorum GBIF