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Lecanora jamesii  J. R. Laundon

Synonyms:

Family: LECANORACEAE

Habitat: Oceanic zone

Description

    Thallus crustose, usually determinate, circular or oval, 1-4 cm across, thin, smooth to minutely granular, greyish, grey-greenish, grey-yellowish, typically with almost transluscent sections, greyish when moist and with sections covered with calcium oxalate crystals (marble aspect of frozen water surfaces), covered with conspicuous and distinct hemispherical soralia, 1-2 mm diam., whitish when dry and yellowish when moist, prothallus thin, fibrous, concolourous although most often blackish in case of mosaics. Apothecia very scarce, most often absent, but in our prospection area some sites frequently may harbour fertile specimen, 0.5-1 mm diam., innate then sessile, disc flat, greenish, brown-pink or blackish, exciple covered with whitish crystals, minutely crenulate, becoming excluded. Ascospores simple, ellipsoid, 10-14 x 6-8 µm. Photobiont: Trebouxia. Thallus: C-, K-, KC-, Pd-; soralia: KC+/- yellow. Rare, mostly found on smooth bark of deciduous trees in humid areas, notably Salix and Fraxinus. Not to be confused with Lecanora barkmaniana which is rather similar but of which the thallus is verrucose and K+ yellow, and with Loxospora elatina of which the soralia are greener, potentially confluent and the thallus is K+ yellow and Pd+ orange.*







Lecanora jamesii Cast 1
Bernard BOUFFINIER



Lecanora jamesii Cast 2
Bernard BOUFFINIER



Lecanora jamesii Cast 3
Bernard BOUFFINIER



Lecanora jamesii Fertile Cast 4
Bernard BOUFFINIER



Lecanora jamesii Cast 5
Bernard BOUFFINIER



Lecanora jamesii Sur Salix Commana
Bernard BOUFFINIER



Lecanora jamesii Quimper
Bernard BOUFFINIER



Lecanora jamesii et son cortège dont Arthopyrenia punctiformis Huelgoat 1
Bernard BOUFFINIER



Lecanora jamesii Fertile Huelgoat 2
Bernard BOUFFINIER



Lecanora jamesii Huelgoat 3
Bernard BOUFFINIER



Lecanora jamesii Fertile Huelgoat 4
Bernard BOUFFINIER



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