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Lecanora gangaleoides Nyl.

Synonyms:

Family: LECANORACEAE

Habitat: Aerohaline zone

Description

    Thallus crustose, uneven, verrucose to warted, areolate, areoles convex, greyish tinged green, lower medulla orange visible in case of cortex erosion (orange spots K+ purple), prothallus (or margin) whitish. Apothecia numerous, sessile, to 2 mm diam., disc flat, soon and persistently convex, blackish, exciple determinate, entire, not contorted nor crenulate, whitish. Hymenium section brown-greenish, olive-green. Ascospores simple,  ellipsoid, 12-15 x 6-8 µm. Photobiont: Trebouxia. C-, K+ bright yellow, Pd+ yellow to red. Common but highly variable, on siliceous rocks in the xeric supralittoral zone up to the aerohaline zone inland on rocks and stones of walls. N.B. May easily be confused with Tephromela atra which is ubiquist, without specific maritime trends but equally frequent near the seashore. The latter differs (sometimes difficultly) by its thallus whitish to greyish and a black prothallus, by its apothecia with a flat disc and irregular and contorted exciple and by its purple hymenium section. In addition, in the field, Rinodina beccariana Bagl. (thallus tinged green) and  Rinodina confragosa (Ach.) Körb. are easy to confuse and observation of bilocular ascospores is required. N.B. In our prospection area, on coastal rocks two other taxa with similar chemical reactions are difficult to distinguih from L. gangaleoidesLecanora cenisia ss. auct. brit. of which the apothecia disc is brown-reddish although sometimes black and even more confusing, Lecanora praepostera of which the thallus is less verrucose, usually K+ yellow > blood-red and apothecia markedly sessile with a less determinate exciple.*







Lecanora gangaleoides Argenton en Landunvez 1
Alain GERAULT



Lecanora gangaleoides Pointe du Raz 3
Alain GERAULT



Lecanora gangaleoides Pointe du Raz 2
Alain GERAULT



Lecanora gangaleoides Pointe du Raz 1
Alain GERAULT



Lecanora gangaleoides Section d'apothécie Camaret
Jacques HAINE



Lecanora gangaleoides Argenton en Landunvez 2
Alain GERAULT



Lecanora gangaleoides Plougastel-Daoulas
Alain GERAULT



Lecanora gangaleoides Pointe de Pen-Hir
Bernard BOUFFINIER



Lecanora gangaleoides Cap de la Chèvre
Bernard BOUFFINIER



Lecanora gangaleoides Cast
Bernard BOUFFINIER



Lecanora gangaleoides Coadry
Bernard BOUFFINIER



Lecanora gangaleoides Pointe de Dinan
Bernard BOUFFINIER



Lecanora gangaleoides Asque dans le bleu coton Cast 3
Jacques HAINE



Lecanora gangaleoides Spores dans le bleu coton Cast 4
Jacques HAINE



Lecanora gangaleoides (right) et Tephromela atra (left) Crozon
Michel DAVID



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