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Roccella fuciformis (L.) DC

Synonyms:

Family: ROCCELLACEAE

Habitat: Xeric supralittoral  zone

Description

    Thallus shrubby, most often pendulous, up to 10-15 cm long, made of branches, flattened, strap-shaped, sometimes scythe blade-shaped, pale grey, pale lilac, brown-lilac, lilac or lilac-purple tinged, medulla white in section. Branches are partially covered with soralia, more or less circular, forming small white flattened mounds clustered towards the margins. This species is seldom fertile except during the last years in Brittany. Apothecia marginal or laminal, scattered over the branches, more or less cup-shaped, 1-2 mm diam., emerging through the cortex and visible as small black protruding buds edged by a membrane concolourous to the thallus . Ascospores colourless, fusiform, straight or slightly curved (banana-shaped) 3-septate, 25-30 x 5-7 µm. Ccortex with palisade plectenchyma, K+ pale yellow, vanishing, C- (see  Roccella fuciformis forma, cortex C+ red-orange, on rocks exposed to the South-West), soralia: C+ pink to red. Photobiont: Trentepohlia. Rather common, forming colonies under  overhangs or on dry vertical walls of large rocks on the foreshore exposed to North or East, but this thermophilic species is frost sensitive. Sometimes found together with Roccella phycopsis of which the branches are not strap-shaped and far less frequent in our prospection area. N.B. Tinctorial species propitious to preparation of purple dyes. Very close to Roccella maderensis that is more thermophiles, paler grey-brownish and cortex C+ red.

Tehler A., Dahlkild A., Eldenäs P. & Feige G.B. 2004. The phylogeny and taxonomy of Macaronesian, European and Mediterranean Roccella (Roccellacea, Arthoniales). Acta Univ. Ups. Symb. Bot. Ups. 34:1, 405-428.







Roccella fuciformis Argenton
Alain GERAULT



Roccella fuciformis Fertile Argenton 1
Alain GERAULT



Roccella fuciformis Fertle Argenton 2
Alain GERAULT



Roccella fuciformis Porspoder 1
Alain GERAULT



Roccella fuciformis Avec Ramalina siliquosa f. Cap de la Chèvre 2
Bernard BOUFFINIER



Roccella fuciformis Avec Ramalina siliquosa f. Cap de la Chèvre 1
Bernard BOUFFINIER



Roccella fuciformis Microscopie d'une apothécie Crozon 3
Jacques HAINE



Roccella fuciformis Pointe de Pen HIr
Bernard BOUFFINIER



Roccella fuciformis Plougrescant
Frédéric TOURNAY



Roccella fuciformis Fertile Crozon 1
Michel DAVID



Roccella fuciformis Fertile Crozon 2
Michel DAVID



Roccella fuciformis Asque Crozon 4
Jacques HAINE



Roccella fuciformis Spores Crozon 5
Jacques HAINE



Roccella fuciformis Habitat Cap de la Chèvre 3
Bernard BOUFFINIER



Roccella fuciformis Avec Ramalina siliquosa f. Cap de la Chèvre 4
Bernard BOUFFINIER



Roccella fuciformis Cap de la Chèvre 5
Bernard BOUFFINIER



Roccella fuciformis Pointe de Pen-Hir 2
Bernard BOUFFINIER



Roccella fuciformis Crozon 3
Bernard BOUFFINIER



Roccella fuciformis (gauche) et Roccella phycopsis (droite) Le Toulinguet
Michel DAVID



Roccella fuciformis RĂ©action C+ rouge sur soralies Camaret
Jacques HAINE



Roccella fuciformis Fertile Le Toulinguet
Michel DAVID



Roccella fuciformis Primel 1
Bernard BOUFFINIER



Roccella fuciformis Primel 2
Bernard BOUFFINIER



Roccella fuciformis avec Roccella tinctoria Taxon Atlantique-Manche Primel 3
Bernard BOUFFINIER



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