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


LITERATURE


DePriest, PT/ Hale, BW (1998) New combinations in parmelioid genera (Ascomycotina: Parmeliaceae). Mycotaxon

Coppins, BJ (2002) Checklist of Lichens of Great Britain and Ireland.

Masson, D. (2005) Taxinomie, ecologie et chorologie des especes françaises des genera Hypotrachyna et Parmelinopsis (Ascomycota lichenises, Parmeliaceae). Cryptogamie, Mycologie

Lendemer, J.C./ Allen, J.L. (2020) A revision of Hypotrachyna subgenus Parmelinopsis (Parmeliaceae) in eastern North America. The Bryologist