Umbilicaria grisea Hoffm.

Deutschl. Fl., 2: 111, 1796.
Synonyms: Gyrophora grisea (Hoffm.) Turner & Borrer; Gyrophora murina (Ach.) Ach.; Umbilicaria murina (Ach.) DC.
Description: Thallus foliose-umbilicate, heteromerous, dorsiventral, monophyllous, adpressed to the substrate, 1-6(-8) cm diam., c. 0.2 mm thick, 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. Epithecium brown; hymenium colourless to brownish, often divided into compartments by columns of sterile tissue; paraphyses simple or sparingly branched, the apical cells more or less swollen; hypothecium thick, dark. 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: medulla K-, C+ red, KC+ red, P-. Chemistry: medulla with gyrophoric acid and small amounts of lecanoric and umbilicaric acids.
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
Montane belt: very rare
Dry submediterranean belt: extremely rare
Humid submediterranean belt: extremely rare
Padanian area: absent

pH of the substrata:

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Poleotolerance:

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Altitudinal distribution:

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Rarity

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Occurrence data
Predictive map

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


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.


Felix Schumm - CC BY 4.0
[VZ1288], Romania. Dobrogea. Distr. Tulcea, supra pagum Camena, 150 m. Ad saxa silicea. Leg. A. V zda, 15.07.1973. EX A. V ZDA: LICHENES SELECTI EXSICCATI NR. 1288.


Felix Schumm - CC BY 4.0
[VZ1288], Romania. Dobrogea. Distr. Tulcea, supra pagum Camena, 150 m. Ad saxa silicea. Leg. A. V zda, 15.07.1973. EX A. V ZDA: LICHENES SELECTI EXSICCATI NR. 1288.


Felix Schumm - CC BY 4.0
[VZ1288], Romania. Dobrogea. Distr. Tulcea, supra pagum Camena, 150 m. Ad saxa silicea. Leg. A. V zda, 15.07.1973. EX A. V ZDA: LICHENES SELECTI EXSICCATI NR. 1288.


Felix Schumm - CC BY 4.0
[VZ1288], Romania. Dobrogea. Distr. Tulcea, supra pagum Camena, 150 m. Ad saxa silicea. Leg. A. V zda, 15.07.1973. EX A. V ZDA: LICHENES SELECTI EXSICCATI NR. 1288.


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