Umbilicaria ruebeliana (Du Rietz & Frey) Frey

Hedwigia, 71: 112, 1931. Basionym: Gyrophora ruebeliana Du Rietz & Frey - Hedwigia, 69: 244, 1929.
Synonyms: Omphalodiscus ruebelianus (Du Rietz & Frey) Schol.
Distribution: N - TAA (Nascimbene 2002), Lomb (Codogno 1995), Piem, VA (Piervittori & Isocrono 1997, 1999).
Description: Thallus foliose-umbilicate, heteromerous, dorsiventral, monophyllous or more rarely polyphyllous, rigid, more or less orbicular, 1-4(-6) cm in diam., attached by a more or less central holdfast. Upper surface dark brown to black, somewhat paler in central part, distinctly areolate, the areoles 0.5-1.5 mm wide. Lower surface dark brown to black, areolate-verrucose, erhizinate or with very few, sparse rhizinomorphs. Upper and lower cortex prosoplectenchymatous, brown in the outer layer; medulla white. Apothecia common, numerous, black, omphalodisc, 0.2-1 mm across. Epithecium black-brown; hymenium colourless; paraphyses simple or sparingly branched, with enlarged apical cells; hypothecium brown in lower part. Asci 8-spored, clavate, thick-walled, with an amyloid apical dome, Umbilicaria-type. Ascospores 1-celled and hyaline, sometimes turning brown and submuriform when overmature, ellipsoid, 11-13.5 x 6-8.5 µm. Photobiont chlorococcoid. Spot tests: medulla K-, C+ red, KC+ red, P-. Chemistry: medulla with gyrophoric and umbilicaric acids (major), plus variable amounts of lecanoric acid.
Note: on steeply inclined to rain-sheltered, often south- or west-facing surfaces of siliceous rocks above treeline, reaching the nival belt; hitherto known only from the Alps in Italy.
Growth form: Foliose, umbilicate
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

Alpine belt: rare
Subalpine belt: absent
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


P.L. Nimis CC BY-SA 04
TSB 11077



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (16529)
2001/12/05



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (11077)
2003/03/17
lower surface


Frey E. 1933. Cladoniaceae (unter Ausschluß ded Gattung Cladonia) und Umbilicariaceae. In: Rabenhrst’s Kryptogamenflora von Deutschland, Österreich und der Schweiz. 15: 1-208.



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (11077)
2003/03/17
apothecia