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Lecanora chlarotera subsp. chlarotera Nyl. forma chlarotera

Synonyms:

Family: LECANORACEAE

Habitat: Ubiquitous

Description

    Thallus crustose, up to 3-12 cm across, relatively thick, rimose to verrucose, pale grey, grey-greenish, prothallus absent (not to be confused with prothallus of another adjacent species !). Apothecia numerous and sometimes packed each others, 0.5-1.5 mm diam., sessile, disc flat then slightly convex, brown, brown-reddish, brown-orange, brown-ochraceous tinged green when moist, exciple thin, persistent, concolourous to the thallus, smooth, minutely crenulate and contorted (if exciple is strongly crenulate see: Lecanora chlarotera subsp. chlarotera forma rugoselle), large crystals not soluble in K may be visible using polarizing light microscope in apothecia section, epithecium granular with a thin layer of crystals. Ascospores simple, broadly ellipsoid,  11-14 x 6-7 µm. Photobiont : Trebouxia. Thallus : C-, K+ yellow, KC-, Pd-. Common but highly variable (a high number of subsp., forms and varieties have already been described, for ex. Lecanora chlarotera subsp. chlarotera forma rugoselle), on barks of main branches and trunks of deciduous trees, notably on ornmental trees in parks or gardens. Easily confused with Lecanora argentata whose prothallus is theoretically blackish and apothecia are scarce, but microscopic observation of an apothecia section is often required to distinguish the two species. N.B. Apothecia often present black dots corresponding to the parasite Vouauxiella lichenicola.*







Lecanora chlarotera subsp. chlarotera forma chlarotera Crozon 4
Bernard BOUFFINIER



Lecanora chlarotera subsp. chlarotera forma chlarotera Châteaulin 2
Bernard BOUFFINIER



Lecanora chlarotera subsp. chlarotera forma chlarotera Crozon 1
Michel DAVID



Lecanora chlarotera subsp. chlarotera forma chlarotera Porz Gwen 1
Alain GERAULT



Lecanora chlarotera subsp. chlarotera forma chlarotera Châteaulin 1
Bernard BOUFFINIER



Lecanora chlarotera subsp. chlarotera forma chlarotera Crozon 2
Bernard BOUFFINIER



Lecanora chlarotera subsp. chlarotera forma chlarotera Crozon 3
Bernard BOUFFINIER



Lecanora chlarotera subsp. chlarotera forma chlarotera Landévennec 1
Bernard BOUFFINIER



Lecanora chlarotera subsp. chlarotera forma chlarotera Châteaulin Pont-Coblant 1
Bernard BOUFFINIER



Lecanora chlarotera subsp. chlarotera forma chlarotera Châteaulin Pont-Coblant 2
Bernard BOUFFINIER



Lecanora chlarotera subsp. chlarotera forma chlarotera Le Fret
Bernard BOUFFINIER



Lecanora chlarotera subsp. chlarotera forma chlarotera Belgique Ardennes
Jacques HAINE



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