Umbilicaria grisea Hoffm.

Deutschl. Fl., 2: 111, 1796.
Synonyms: Gyrophora grisea (Hoffm.) Turner & Borrer; Gyrophora murina (Ach.) Ach.; Umbilicaria murina (Ach.) DC.
Distribution: N - TAA, Lomb (De Vita & Valcuvia 2004), Piem (TSB s.n.), VA (Valcuvia 2000). C - Sar (Nöske 2000). S - Bas (Potenza 2006, Potenza & Fascetti 2012, Lich. Ital. Exs. 52: Isocrono & al. 2021), Cal (Puntillo 1996), Si (Caniglia & Grillo 2003).
Description: Thallus foliose-umbilicate, dorsiventral, monophyllous, adpressed to substrate, 1-5(-8) cm diam., even or slightly raised only over the umbilicus, attached by a single, short central holdfast, the margins moderately incised and folded, sometimes lacerate, slightly down-turned. Upper surface dark grey brown, distinctly rimose, weakly areolate in central parts, white-pruinose and sorediate toward margins. Lower surface dark brown to black, distinctly areolate around the umbilicus, without trabeculae; rhizinomorphs absent or, rarely, single to weakly branched, concolorous with lower cortex; thalloconidia absent. Upper cortex 10-18 µm thick; medulla white, loose in upper part, well differentiated from the scleroplectenchymatous, brown lower cortex. Apothecia rare, black, gyrodisc, 0.5-1.5 mm across. Asci 8-spored, clavate, thick-walled, with an amyloid apical dome, Umbilicaria-type. Ascospores 1-celled hyaline, ellipsoid, 13-17 x -7.5-9(-10) µm. Photobiont chlorococcoid. Spot tests: K-, C+ red, KC+ red, P-. Chemistry: medulla with gyrophoric acid and small amounts of lecanoric and umbilicaric acids.
Note: on steeply inclined to rain-sheltered surfaces of siliceous rocks only slightly wetted after rain, usually below the Alpine belt.
Growth form: Foliose, umbilicate
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly asexual, by soredia, or soredia-like structures (e.g. blastidia)
In underhangs rarely wetted by rain

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: absent
Oromediterranean belt: absent
Montane belt: very rare
Submediterranean belt: extremely rare
Padanian area: absent
Humid submediterranean belt: extremely rare
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

Leif Stridvall - Source: http://www.stridvall.se/la/galleries.php



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (11067)
2003/03/17



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (11047)
2001/12/05
detail of lower surface



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (11047)
2001/12/05
detail of upper surface


Costanza Sartori; Owner: Costanza Sartori


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


Leif Stridvall - Source: http://www.stridvall.se/la/galleries.php


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_U/Umbilicaria_grisea.htm
France, session AFL 2008 - Lozère


Jacques Haine - Source:http://www.lichensmaritimes.org/index.php?task=fiche&lichen=245&lang=en
Belgium, Monthermé


Jacques Haine - Source:http://www.lichensmaritimes.org/index.php?task=fiche&lichen=245&lang=en
Belgium, Monthermé


Jacques Haine - Source:http://www.lichensmaritimes.org/index.php?task=fiche&lichen=245&lang=en
Belgium, Monthermé


Jacques Haine - Source:http://www.lichensmaritimes.org/index.php?task=fiche&lichen=245&lang=en
Belgium, Monthermé


Jacques Haine - Source:http://www.lichensmaritimes.org/index.php?task=fiche&lichen=245&lang=en
France, Mercantour


Ulrich Kirschbaum
Central Europe.


Ulrich Kirschbaum
Central Europe.