ITALIC 8.0

Umbilicaria pallens Poelt

in Hasenhüttl & Poelt, Ber. deutsche bot. Ges., 91, 2-3: 282, 1978

Synonyms:

Distribution:

Description: Thallus foliose-umbilicate, heteromerous, dorsiventral, mono- or much more rarely polyphyllous, 2-7 cm wide, sometimes perforate in marginal parts. Upper surface pale grey, except the central parts, which are whitish, furfuraceous-squamulose, radially sulcate around the umbilicus. Lower surface erhizinate, without thalloconidia, pale brown, the marginal parts whitish-pruinose. Apothecia frequent, black, leiodisc, constricted at base to subpedicellate, with a smooth disc. Epithecium brown; hymenium colourless; paraphyses simple or sparingly branched, the apical cells more or less swollen; hypothecium dark. Asci 8-spored, elongate-clavate, thick-walled, with an amyloid apical dome, Umbilicaria-type. Ascospores 1-celled, hyaline, narrowly ellipsoid, 10-20 x 3-7 µm. Photobiont chlorococcoid. Spot tests: K-, C- or C+ faintly red, KC- or KC+ faintly red, P-. Chemistry: medulla with usually low amounts of gyrophoric acid.

Note: a silicicolous species resembling U. subglabra, but lacking thalloconidia and lower surface therefore pale greyish, regularly bearing apothecia with smooth discs; widespread in the mountains of SW Europe, with several scattered records from the Alps, all outside Italian territory. To be looked for in the Alps.

Growth form: Foliose, umbilicate

Substrata: rocks

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual

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

P.L. Nimis CC BY-SA 4.0

TSB 10898

Pier Luigi Nimis - CC BY-SA 4.0

Herbarium: TSB 10898