ITALIC 8.0

Thelidium rehmii Zschacke

Hedwigia, 62: 116, 1920.

Synonyms:

Distribution:

Description: Thallus crustose, thinly episubstratic, continuous to finely rimose, grey-white to olive-green, subgelatinous when wet, proso- or paraplectenchymatous; photobiont cells irregularly arranged. Perithecia scattered, black, 0.2-0.3 mm across, forming hemispherical projections. Involucrellum absent; exciple globose, black, except at the pale brown to colourless lowermost 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, ellipsoid, (13-)21-28(-31) x (4-)9-13(-15) μm. Photobiont chlorococcoid. Spot tests: K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.

Note: on sandstone and siliceous schists in humid situations, at low elevations; rare throughout Central Europe, with several scattered records from the Eastern Alps, outside the Italian territory; to be looked for in the Italian Alps.

Growth form: Crustose

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: Keissler K. von 1938. Pyrenulaceae, Mycoporaceae, Coniocarpineae. In: Rabenhorst G L: Kryptogamen-Flora von Deutschland, Österreich und der Schweiz. 2nd, IX, Die Flechten, Abt. 1, 2. Gebr. Borntraeger, Leipzig, pp. 1-846.