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Lepraria incana (L.) Ach.

Synonyms:

Family: STEREOCAULACEAE

Habitat: Ubiquitous

Description

    Thallus leprose, farinose, composed of minute globose soredia, 0.05-0.1 mm diam., sometimes covered with more or less short spiking hyphae (only visible under microscope or magnifying lens), crust-forming, crust more or less thick, occasionally areolate or fractionate, margin diffuse, grey-greenish tinged blue, grey-bluish, green-yellowish tinged blue. Apothecia unknown. Photobiont: green algae. Thallus: C-, K+/- yellowish, KC-, Pd-, UV : UV: white-bluish but sometimes pale orange (worth to mention: one chemotype is K+ purple and KC+ purple). Very common, always in shaded areas and protected from direct rainfall, in fissures and crevices of rocks, stones of old walls, on north surfaces of tree trunks in crevices of rough and mossy barks. N.B. As for most of the Lepraria species, identification requires result analyses of the chemical reactions. The pictures of the specimen presented here are based on the blue colour, the chemical spot tests results and microspcope observation of the thalli of this species taken here in the broad sense.







Lepraria incana Roc'h Trévézel
Bernard BOUFFINIER



Lepraria incana Brest 1
Alain GERAULT



Lepraria incana Brest 2
Alain GERAULT



Lepraria incana Brest 3
Alain GERAULT



Lepraria incana Sur Quercus Ménez Meur
Alain GERAULT



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