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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 to yellowish in dry weather and greenish in wet weather, 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 (resemble those of Lecanora chlarotera with a sorediate margin). 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, notably Salix, Fraxinus and Alnus, in very humid areas in hyperoceanic forests. 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
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Lecanora jamesii Cast 2
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Lecanora jamesii Cast 3
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Lecanora jamesii Fertile Cast 4
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Lecanora jamesii Cast 5
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Lecanora jamesii Roscanvel 6
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Lecanora jamesii fertile Roscanvel S12
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Lecanora jamesii Roscanvel 3
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Lecanora jamesii Roscanvel 4
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Lecanora jamesii Roscanvel 5
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Lecanora jamesii Huelgoat 3
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Lecanora jamesii fertile Roscanvel S11
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Lecanora jamesii Plougastel-Daoulas 1
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Lecanora jamesii Plougastel-Daoulas 2
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Lecanora jamesii Plougastel-Daoulas 3
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Lecanora jamesii Plougastel-Daoulas 4
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Lecanora jamesii Roscanvel 2
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Lecanora jamesii Roscanvel 1
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Lecanora jamesii Stangala 3
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Lecanora jamesii Roscanvel 7
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Lecanora jamesii Roscanvel 8
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Lecanora jamesii Roscanvel 9
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Lecanora jamesii fertile Roscanvel S13
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