ITALIC 7.0

Thelocarpon pallidum G. Salisb.

North West. Nat.: 75, 1953

Synonyms:

Distribution:

Description: Thallus crustose, reduced to small, scattered, 0.2-0.4 mm wide fruiting warts, colourless to pale yellow and translucent when moist, sometimes yellow-pruinose only at apex. Ascocarps frequent, perithecioid, fully immersed in the warts, with a concave, not exposed disc (the warts opening though a small pore). Exciple colourless, with an algal sheath, the outermost part free of algae, c. 20 μm thick, pseudocorticate; hymenial gel I- or I+ red, K/I+ blue; paraphyses absent; periphyses branched, easily detached, 6-20 μm long, arranged around the ostiole and on the sides. Asci many-spored, flask-shaped, tapering to apex, thin-walled, the wall I+ pale blue, not thickened at apex. Ascospores 1-celled, hyaline, oblong-ellipsoid, thin-walled, not constricted in the middle, 6-9(-10) x 3-3.5 μm, sometimes biguttulate. Photobiont chlorococcoid. Spot tests: K-, C-, KC-, P-. Chemistry: yellow pruina with pulvinic acid derivatives.

Note: an ephemeral pioneer lichen found on siliceous or weakly calciferous substrata (roofing tiles, pebbles on the ground) in humid sites; widespread but not common in Central and Western Europe, but perhaps very much overlooked. To be looked for in Italy.

Growth form: Crustose

Substrata: rocks

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual

Pioneer species

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