Thelidium schibleri Zschacke

Hedwigia, 62: 138, 1920.
Synonyms:
Distribution: N - TAA (Nascimbene & al. 2021, 2022).
Description: Thallus crustose, very thinly episubstratic, forming sparse, irregular, dark brown to almost black, poorly delimited flecks. Perithecia black, sparse, c. 0.3 mm across, half immersed, at first covered by a thin thalline layer, then the emerging part naked at least in upper half, hemispherical, smooth. Involucrellum limited to the upper half of the perithecium, adpressed to exciple; exciple brown to brown-black in upper part, pale in lower part; hamathecium of periphyses and periphysoids, interascal filaments absent; hymenial gel I+ red (I+ blue at very low concentrations of I), K/I+ blue. Asci 8-spored, ellipsoid to clavate, I-, fissitunicate, the wall thickened above, with an ocular chamber, dehiscent by extrusion of a delicate rostrum. Ascospores 1-septate, hyaline, broadly ellipsoid, 38-45 x 14-18 μm. Photobiont chlorococcoid. Spot tests: K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: a critical taxon of calciferous rocks that, similar to other Thelidium-species, would require further research to clarify its taxonomic position. The Italian specimen was collected in a very humid wall of the early Triassic Werfen-formation composed of carbonatic, terrigenous and mixed, varicolored deposits that are sometimes dolomitized. The ecological conditions of the Italian site are similar to those of the type locality in Switzerland, where the species was found together with Polyblastia cupularis, as in the Italian site.
Growth form: Crustose
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
Poorly known taxon in need of further study

Commonnes-rarity: (info)

Alpine belt: extremely 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
Herbarium samples
Index Fungorum GBIF


J. Nascimbene - CC BY-SA 4.0



J. Nascimbene - CC BY-SA 4.0



J. Nascimbene - CC BY-SA 4.0


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



J. Nascimbene - CC BY-SA 4.0



J. Nascimbene - CC BY-SA 4.0