Hypotrachyna britannica (D. Hawksw. & P. James) Coppins

Checklist of Lichens of Great Britain and Ireland: 86, 2002.. Basionym: Parmelia britannica D. Hawksw. & P. James - in Vězda, Lich. Sel. Exs., 47: 4, no. 1164, 1973
Synonyms:
Distribution:
Description: Thallus foliose, heteromerous, dorsiventral, moderately adnate to appressed, forming more or less regular, up to 6(-8) cm broad rosettes, sorediate. Lobes 0.5-3 (-4) mm wide, dichotomously branched with rounded axils and truncate tips, often suberect in central parts of thallus, rarely ciliate, the upper surface pale ash-grey or pale blue-grey, usually emaculate, smooth, but often patchily pustulose, the pustules tending to break off into subterminal or laminal soralia, the soredia granulose, dark blue or almost black when dry; lower surface matt, more or less veined or canaliculate, black in central parts, dark brown at margins, with short, mostly forked, sometimes simple or dichotomously branched, black or brown-black rhizines. Upper cortex of tightly packed, anticlinally oriented hyphae, with a pored epicortex, the cell walls with isolichenan; medulla white, but appearing black in the exposed parts under eroded soralia; lower cortex brown, of anticlinally oriented hyphae. Apothecia unknown. Photobiont: chlorococcoid. Spot tests: upper cortex K+ yellow,C-, KC-, P-; medulla: K-, C+ pink, KC+ pink-red, P-. Chemistry: upper cortex with atranorin and chloroatranorin; medulla with gyrophoric acid (major), lecanoric acid, hiascic acid, 4,5-di-0-methylhiascic acid, 4-0-methylhiascic acid (minor).
Note: a mainly Atlantic, silicicoulous species, also known from Southern France, Corsica (Roux & Coll 2014), and the southern Swiss Alps; to be looked for in Italy.
Growth form: Foliose

Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly asexual, by soredia, or soredia-like structures (e.g. blastidia)
Most common in areas with a humid-warm climate (e.g. most of Tyrrenian Italy)

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Predictive model

zaca - CC BUY-SA 3.0 - Source: https://mycoportal.org/portal/taxa/index.php?taxon=248713
Portugal



Felix Schumm - CC BY-SA 4.0
[20360], Romania, Dobrogea, Distr. Tulcea, supra pagum Camena, 150 m, ad saxa silicea locis septentrionem spectantibus. Leg. A. Vezda, 15.07.1973. A. VEZDA: LICHENES SELECTI EXSICCATI NR. 1189.



Felix Schumm - CC BY-SA 4.0
[20360], Romania, Dobrogea, Distr. Tulcea, supra pagum Camena, 150 m, ad saxa silicea locis septentrionem spectantibus. Leg. A. Vezda, 15.07.1973. A. VEZDA: LICHENES SELECTI EXSICCATI NR. 1189.



Felix Schumm - CC BY-SA 4.0
[20361], Magna Britannia, Cambria, Anglesey, Holy Island, Holyhead, inter Plas Meilw et Bod-Warren, 15 m, in rupibus siliceis umbrosis maritimis. Leg P. W. James, 6.4.1973. A. VEZDA: LICHENES SELECTI EXSICCATI NR. 1164



Felix Schumm - CC BY-SA 4.0
[20360], Romania, Dobrogea, Distr. Tulcea, supra pagum Camena, 150 m, ad saxa silicea locis septentrionem spectantibus. Leg. A. Vezda, 15.07.1973. A. VEZDA: LICHENES SELECTI EXSICCATI NR. 1189.



Felix Schumm - CC BY-SA 4.0
[20361], Magna Britannia, Cambria, Anglesey, Holy Island, Holyhead, inter Plas Meilw et Bod-Warren, 15 m, in rupibus siliceis umbrosis maritimis. Leg P. W. James, 6.4.1973. A. VEZDA: LICHENES SELECTI EXSICCATI NR. 1164



Felix Schumm - CC BY-SA 4.0
[20361], Magna Britannia, Cambria, Anglesey, Holy Island, Holyhead, inter Plas Meilw et Bod-Warren, 15 m, in rupibus siliceis umbrosis maritimis. Leg P. W. James, 6.4.1973. A. VEZDA: LICHENES SELECTI EXSICCATI NR. 1164



Felix Schumm CC BY-SA 4.0
[20361], Magna Britannia, Cambria, Anglesey, Holy Island, Holyhead, inter Plas Meilw et Bod-Warren, 15 m, in rupibus siliceis umbrosis maritimis
Leg P. W. James, 6.4.1973. A. VEZDA: LICHENES SELECTI EXSICCATI NR. 1164