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Evernia prunastri (L.) Ach. var. prunastri

Synonyms:

Family: PARMELIACEAE

Habitat: Ubiquitous

Description

    Thallus apparently fruticose, anatomically foliose, small bush forming, 3-6 cm long, lobes rather soft in general pendent, strap-shaped, branched, with tips palmated, with mostly towards the margin non-delimited farinose soralia, oval to circular (sometimes very numerous, see Evernia prunastri forma), upper surface green-grey to pale green-yellow, often with an incomplete network of elongate ridges, lower surface  minutely cannulated, whitish. Apothecia very rare, on top of stipe, 2-5 mm diam., disc brownish, exciple thin soon disappearing. Pycnidia frequent. Utriform asci, 30-35 x 16-20 µm according to our measurements, with 8 spores. Simple colorless spores, largely elliptical to globular, 7-11 x 4-6 µm according to the literature, 7-10 x 5-6 µm according to our measurements. Photobiont: chlorococcoid. Cortex: C-, K+ yellow on both faces, KC-, Pd-; medulla: C-, K-, KC-, Pd-. Widespread all over deciduous trees, notably branches and twigs, more scarce on coniferous in our prospection area, and very rare on soils (see  Evernia prunastri var. arenaria) and on rocks (see Evernia prunastri var. prunastri on rock) . Easily confused with some Ramalina species of which the straps have the same colours on both faces but more stiff. There is one taxon lacking usnic acid, very pale grey: see Evernia prunastri f. herinii. N.B. The thallus of this species has a fruticose appearance but it is actually foliose due to the structure of its branches.







Evernia prunastri Aber 1
Michel DAVID



Evernia prunastri Crozon 2
Bernard BOUFFINIER



Evernia prunastri Crozon 3
Bernard BOUFFINIER



Evernia prunastri Tromel
Michel DAVID



Evernia prunastri Fertile Menez Meur
Bernard BOUFFINIER



Evernia prunastri Rosno毛n 1
Bernard BOUFFINIER



Evernia prunastri Rosno毛n 2
Bernard BOUFFINIER



Evernia prunastri Apoth茅cie Dr么me 3
Jacques HAINE



Evernia prunastri var. prunastri Argol
Michel DAVID



Evernia prunastri Aber 2
Michel DAVID



Evernia prunastri fertile Dr么me proven莽ale 1
Jacques HAINE



Evernia prunastri fertile Dr么me proven莽ale 2
Jacques HAINE



Evernia prunastri Coupe apoth茅cie micro Dr么me 4
Jacques HAINE



Evernia prunastri Asques eau + KOH Dr么me 5
Jacques HAINE



Evernia prunastri Asques Lugol Dr么me 6
Jacques HAINE



Evernia prunastri Asques Bleu Coton Dr么me 7
Jacques HAINE



Evernia prunastri Spores & photobionte Bleu Coton Dr么me 8
Jacques HAINE



Evernia prunastri fertile Dr么me proven莽ale 13
Jacques HAINE



Evernia prunastri Landevennec 1
Bernard BOUFFINIER



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