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Graphis elegans  (Borrer ex Sm.) Ach.

Synonyms:

Family: GRAPHIDACEAE

Habitat: Oceanic zone

Description

    Thallus very thin, forming coating on bark, smooth to minutely wrinkled, whitish, pale greyish, pale grey-greenish, pale grey-brownish, white-greenish. Apothecia usually in limited numbers, lirelliform, short or elongate, 1-2.5 mm long, straight or curved, seldom branched, black, sides rather wide and thick with typically with several longitudinal furrows, disc persistently slit-like, black (N.B. when falling down, lirellae leave two black strokes on the thallus). Ascospores markedly elongate, fusiform, colourless or slightly dark brown, 10-12-septate, 32-55 x 6-12 µm. Photobiont: Trentepohlia. Thallus : C-, K+ yellow turning red, Pd+ yellow-orange (sometimes faint or hardly visible). Common, oceanic trends, on smooth bark of deciduous trees (notably Betula).  See Graphis scripta of which the apothecia are more numerous and the thallus K-. N.B. The typical lirellae, with several longitudinal furrows, sometimes are rare or absent on the same thallus and the best determining marker on the field is the thallus K+ red reaction.*







Graphis elegans sur Betula Châteaulin
Bernard BOUFFINIER



Graphis elegans sur Betula Châteaulin 2
Bernard BOUFFINIER



Graphis elegans sur Betula Saint Cadou
Bernard BOUFFINIER



Graphis elegans sur Betula Saint-Rivoal 1
Bernard BOUFFINIER



Graphis elegans sur Betula L'Aber en Crozon
Bernard BOUFFINIER



Graphis elegans Trégarvan 1
Alain GERAULT



Graphis elegans sur Betula Dinéault 2
Bernard BOUFFINIER



Graphis elegans Asques
Jacques HAINE



Graphis elegans Spore
Jacques HAINE



Graphis elegans sur Betula Dinéault 1
Bernard BOUFFINIER



Graphis elegans sur Fraxinus Gouézec 1
Bernard BOUFFINIER



Graphis elegans sur Fraxinus Gouézec 2
Bernard BOUFFINIER



Graphis elegans sur Fraxinus Gouézec 3
Bernard BOUFFINIER



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