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Buellia subdisciformis (Leight.) Vain.

Synonyms:

Family: PHYSCIACEAE

Habitat: Xeric supralittoral  zone

Description

   Thallus crustose, 2-5 cm diam., rather thick, cracked as an old faience, whitechalk, whitish to dull white with a pale yellow-brown tinge or sometimes green-brown, usually delimited by a clearly visible black prothallus especially in case of several colonies forming mosaics.  Apothecia numerous, regularly distributed, sessile, 1-1.5 mm diam., disc plane to slightly convex, black, occasionally pruinose at least when young, exciple greyish, prominent, mostly persistent, often wavy. Pycnidia occasionally numerous and clearly visible as blackish dots. Ascospores ellipsoid, brown, 1-septate, 10-19 x 6-10 µm. Photobiont : Chlorococcales. Thallus C-, K + yellow~red (crystals), Pd+ yellow-orange. Common in xeric supralittoral zone often under overhangs of hard siliceous coastal rocks but also in the aerohaline zone on siliceous rocks and old walls when not directly exposed to rain. N.B. Variable according to the locations where it grows but always easy to recognize, particularly for atypical specimen, by the mean of chemical spot tests.*  







Buellia subdisciformis Pointe de Pen-Hir 11
Michel DAVID



Buellia subdisciformis Crozon
Alain GERAULT



Buellia subdisciformis Pointe d'Armorique
Alain GERAULT



Buellia subdisciformis Landévennec 1
Bernard BOUFFINIER



Buellia subdisciformis Sainte Anne la Palud
Alain GERAULT



Buellia subdisciformis Sainte Anne la Palud 2
Alain GERAULT



Buellia subdisciformis Saint Hernot
Alain GERAULT



Buellia subdisciformis Pointe de l'Armorique 2
Alain GERAULT



Buellia subdisciformis Cap de la Chèvre 1
Michel DAVID



Buellia subdisciformis Cap de la Chèvre 2
Michel DAVID



Buellia subdisciformis Saint Hernot 2
Joël QUERELLOU



Buellia subdisciformis Pointe de Rostudel
Michel DAVID



Buellia subdisciformis Landévennec 2
Bernard BOUFFINIER



Buellia subdisciformis Coupe apothécie K + E Roscanvel 1
Jacques HAINE



Buellia subdisciformis Asque Eau Roscanvel 2
Jacques HAINE



Buellia subdisciformis Asque et spores Lugol Roscanvel 3
Jacques HAINE



Buellia subdisciformis Spores Eau Roscanvel 4
Jacques HAINE



Buellia subdisciformis Argol
Bernard BOUFFINIER



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