Gyalecta erythrozona Lettau

Feddes Rep., Beih., 69: 141, 1937.
Synonyms:
Distribution: N - Frl (Tretiach 2015h), Ven (Nascimbene & al. 2021), TAA (Nascimbene & al. 2022).
Description: Thallus crustose, thinly episubstratic, usually granular, reddish to pinkish grey, turning grey in the herbarium. Apothecia 0.5-1.5(-2) mm across, with a concave to flat, pinkish orange but usually bluish grey-pruinose disc and a smooth, pruinose proper margin which rapidly turns carmine-red when wet. Proper exciple pale pink to brownish yellow in outer part, colourless within; epithecium orange-brown; hymenium and hypothecium colourless; paraphyses coherent, simple or sparingly branched in upper part. Asci 8-spored, cylindrical to elongate-subclavate, thin-walled, without tholus, the wall and the contents I+ blue. Ascospores 6-8 septate (rarely with an additional oblique septum), narrowly fusiform, hyaline, 20-48 x 4-7 μm. Photobiont trentepohlioid. Spot tests: K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: a species of the G. leucaspis-group characterised by the entire (rather than radially incised) apothecial margins, and the elongate-fusiform (rather than acicular) ascospores; it grows on schists containing some calcium, on moist, shaded, steep rock faces or under overhangs; widely distributed in the Holarctic region, in the Central-European orobiomes it mostly occurs near or above treeline.
Growth form: Crustose
Substrata: rocks
Photobiont: Trentepohlia
Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

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

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Pier Luigi Nimis CC BY-SA 4.0
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Pier Luigi Nimis - CC BY-SA 4.0
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Pier Luigi Nimis CC BY-SA 4.0
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P.L. Mimis CC BY-SA 4.0
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