ITALIC 8.0

Thelidium arnoldii Zschacke

Rabenhorst's Krypt.-Fl., 2nd ed., 9, 1. 1): 344, 347, fig. 169, 1933.

Synonyms:

Distribution:

Description: Thallus crustose, endosubstratic, whitish, usually poorly visible. Perithecia black, 0.4-0.5 mm across, at first completely immersed in pits in the rock and with only the ostiole visible, later slightly projecting and surrounded by a slight thalline swelling, leaving deep pits when they fall out. Involucrellum absent; exciple brown-black throughout; 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 and c. 32 x 16 μm or 3-septate and 33-40 x 16-20 μm, hyaline, ellipsoid. Photobiont chlorococcoid. Spot tests: K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.

Note: on limestone, most common at low elevations, with several records from the Eastern Alps (Austria); distribution poorly known, because often not distinguished from Th. incavatum; to be looked for in the Italian Alps.

Growth form: Crustose endolithic

Substrata: rocks

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual

Poorly known taxon in need of further study

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

Index Fungorum GBIF

Source: 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