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Heterodermia leucomela (L.) Poelt

Synonyms:

Family: PHYSIACEAE

Habitat: Xeric supralittoral  zone

Description

    Thallus forming small bush, 5-15 cm across, loosely attached, lobes loose, ribbon-like or strap-shaped, 2-3 mm wide, more or less branched, curved and entangled, ascending. Strap surfaces whitish on both sides, lower surface slightly powdery and then sorediate mainly towards margin and fringed with conspicuous marginal cilia, black to blackish, up to 1 cm long. Apothecia not observed in our prospection area. Photobiont: chlorococcoid. C-, K yellow >red, KC yellow>red, C -, Pd yellow. This species is both emblematic and patrimonial, currently very rare and on the decline. Grows in rock mossy crevices of coastal cliffs in temperate regions, from xeric supralittoral zone to close aerohaline zone, very rare in oceanic zone on twigs or branches at the top of old trees (can hardly be observed unless they fall down). In the Finistère, in many locations where it was possible to find healthy specimen, this species has almost disappeared or is reduced to a few stunted lobes. Herbarium specimen presented here are a good example, the former sample station is nowadays almost destroyed. (DO NOT SAMPLE).*







Heterodermia leucomela Kerdreux 1
Michel DAVID



Heterodermia leucomela Kerdreux 3
Michel DAVID



Heterodermia leucomela Kerdreux
Alain GERAULT



Heterodermia leucomela Pointe de Pen Hir
Michel DAVID



Heterodermia leucomela Pointe de Pen Hir
Michel DAVID



Heterodermia leucomela Pointe de Pen Hir 3
Michel DAVID



Heterodermia leucomela Cap de la Chèvre
Michel DAVID



Heterodermia leucomela Herbier LEBEURIER
François SEITE



Heterodermia leucomela Kerdreux 2
Michel DAVID



Heterodermia leucomela Pointe de Pen Hir 4
Michel DAVID



Heterodermia leucomela Kerdreux 4
Michel DAVID



Heterodermia leucomela Cap de la Chèvre 2
Michel DAVID



Heterodermia leucomela Cap de la Chèvre 2
Michel DAVID



Heterodermia leucomela Cap de la Chèvre 3
Michel DAVID



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