Lecidea umbonata (Hepp) Mudd

Man. Brit. Lich.: 204, 1861. Basionym: Biatora umbonata Hepp - Flecht. Eur.: nr. 257, 1857.
Synonyms: Lecidea acosmeta Lettau; Lecidea exornans (Arnold) Nyl.; Lecidea omphaliza Lettau; Lecidea umboniza Nádv.; Lecidella exornans (Arnold) Arnold; Lecidella umbonata (Hepp) Körb.; Lecidella umbonata f. exornans Arnold
Distribution: N - Frl, Ven (Caniglia & al. 1999, Nascimbene & Caniglia 2000), TAA (Hertel 2001, Nascimbene 2008b, Hertel & Schuhwerk 2010), Lomb (Herb. Nascimbene 4815), Piem (Hertel 2001, Hertel & Schuhwerk 2010), Lig. C - Tosc (Jatta 1909-1911), Umb (Panfili 2007), Abr (Nimis & Tretiach 1999).
Description: Thallus crustose, episubstratic, chalky white to grey-white, 0.3-1.5 mm thick, continuous to faintly rimose, frequently delimited by a thin, black hypothalline line. Medulla white, mostly I+ blue. Apothecia lecideine, dull black, immersed to adnate, usually angular, 0.5-1.5(-2.5) mm across, with a flat to convex, frequently umbonate disc and a well-developed, undulate, raised proper margin. Proper exciple green or green-black and N+ purple in outer part, paler within; epithecium green to green-brown or black-brown, K-, N+ purple; hymenium colourless to pale pink, rarely pale green, 50-80 μm high; paraphyses coherent, simple or sparingly branched and anastomosing, 1.8-2.2 μm thick at mid-level, the apical cells capitate, to 4.5 μm wide; hypothecium colourless to pale ochraceous brown. Asci 8-spored, narrowly clavate, thick-walled, with a K/I+ pale blue tholus and a strongly amyloid, thin apical cushion, surrounded by a I+ blue outer layer, Lecidea-type. Ascospores 1-celled (but with a conspicuous plasma bridge and appearing 2-celled), hyaline, blunt ellipsoid, (8-)10-13(-15) x 5-7(-8) μm, not halonate. Pycnidia rare, black, immersed. Conidia bacilliform, 8-12 μm long. Photobiont chlorococcoid. Spot tests: thallus K-, C-, KC-, P-, UV-. Chemistry: thallus without lichen substances.
Note: a circumpolar, mainly arctic-alpine, variable species (Hertel 2006) found on calciferous siliceous rocks, especially schist, in cool and humid situations near or above treeline; most frequent in the Alps, where it reaches the nival belt, but also present along the Apennines.
Growth form: Crustose
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

Alpine belt: common
Subalpine belt: rather common
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


P.L. Nimis CC BY-SA 04
TSB 33961



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (33669)
2003/03/12



Juri Nascimbene - CC BY-SA 4.0
Italy, Trentino-Alto Adige, Bolzano/Bozen, Sciliar/Schlern



Juri Nascimbene - CC BY-SA 4.0
Italy, Trentino-Alto Adige, Bolzano/Bozen, Sciliar/Schlern



Juri Nascimbene - CC BY-SA 4.0
Italy, Trentino-Alto Adige, Bolzano/Bozen, Sciliar/Schlern



Juri Nascimbene – CC BY-SA 4.0; Owner: Department of ùLife Sciences, University of Trieste
Vette Feltrine, Prov. Belluno, Veneto,Italy
2006



Juri Nascimbene – CC BY-SA 4.0; Owner: Department of ùLife Sciences, University of Trieste
Vette Feltrine, Prov. Belluno, Veneto,Italy
2006



Juri Nascimbene – CC BY-SA 4.0; Owner: Department of ùLife Sciences, University of Trieste
Vette Feltrine, Prov. Belluno, Veneto,Italy
2006



P.L. Nimis CC BY-SA 04
Herb. J. Nascimbene



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (33198)
2001/12/08



P.L. Nimis CC BY-SA 04
TSB 33961