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Lecanora argentata  (Ach.) Malme

Synonyms:

Family: LECANORACEAE

Habitat: Ubiquitous

Description

    Thallus crustose, continuous, to 3-10 cm across, relatively thin, granulose to verrucose, more or less cracked, whitish, pale grey, grey-silver, pale grey-yellow, prothallus black, usually present, often visible, as greyish spot where thallus is thiner (check the hypothallus presence between thallus cracks, the prothallus seen can be the one of another species below this one). Apothecia 0.5-1.5 mm diam., sessile, usually not numerous and scattered, flat then slightly convex, disc brownish, brown-reddish, usually not very homogenous, hymenium sometimes lacking, leaving an empty bowl, rather glossy, pruine absent, exciple smooth, concolourous to the thallus, containing massive crystals not soluble in potassium and visible using polarized light microscopy, epithecium without granules nor crystals. Ascospores simple, broadly ellipsoid, 10-15 x 6-8 µm. Photobiont: Trebouxia. Thallus: C-, K+ yellow, P+/- pale yellow or P+ yellow. Rather common, on smooth barks of deciduous trees (notably Fraxinus). Easily mistaken with Lecanora chlarotera of which the general aspect is very similar, but with a less smooth thallus, devoid of black prothallus and with apothecia colours more homogenous. Observation of apothecia sections, using polarized light microscopy, are often required to distinguish the two species.*







Lecanora argentata Crozon 1
Alain GERAULT



Lecanora argentata Crozon 2
Alain GERAULT



Lecanora argentata Crozon 3
Alain GERAULT



Lecanora argentata Lesteven 1
Bernard BOUFFINIER



Lecanora argentata Landévennec
Alain GERAULT



Lecanora argentata Crozon 4
Bernard BOUFFINIER



Lecanora argentata Langres 2
Jacques HAINE



Lecanora argentata Asques et spores Mercantour
Jacques HAINE



Lecanora argentata Lesteven 2
Bernard BOUFFINIER



Lecanora argentata Lesteven 3
Bernard BOUFFINIER



Lecanora argentata Lesteven 4
Bernard BOUFFINIER



Lecanora argentata Lesteven 5
Bernard BOUFFINIER



Lecanora argentata Lesteven 6
Bernard BOUFFINIER



Lecanora argentata Lesteven 7
Bernard BOUFFINIER



Lecanora argentata et Lecidella elaeochroma Camaret
Bernard BOUFFINIER



Lecanora argentata Le Fret
Bernard BOUFFINIER



Lecanora argentata Cast
Bernard BOUFFINIER



Lecanora argentata Huelgoat 1
Bernard BOUFFINIER



Lecanora argentata Huelgoat 2
Bernard BOUFFINIER



Lecanora argentata Coupe apothécie Argol 1
Jacques HAINE



Lecanora argentata Coupe apothécie micro eau Argol 2
Jacques HAINE



Lecanora argentata Asques et paraphyses Bleu Coton Argol 3
Jacques HAINE



Lecanora argentata Spores Bleu Coton Argol 4
Jacques HAINE



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