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Porpidia macrocarpa (DC.) Hertel & Knoph.

Synonyms:

Family: PORPIDIACEAE

Habitat: Ubiquitous

Description

    Thallus thin, smooth to rimose, seldom thick, areolate to more or less verrucose, pale grey, grey-greenish, often partly covered with rusty spots, prothallus inconspicuous or wavy and blackish. Apothecia usually numerous, scattered over the thallus, sessile, to 3 mm diam., disc flat then convex and finally markedly convex, sometimes gyrose or with 'multiple' exciples, black, seldom powdered with grey pruine, exciple more or less wavy apparently dividing apothecia as if there were several exciples, thick (0.15-0.2 mm wide), persitent for a long time, black. Ascospores colourless, simple, ellipsoid, 16-20 x 5-12 µm. Photobiont: ChlorococcoidMedulla: K+/- yellow, Pd+/- yellow-orange, I-. Not especially maritime but common on acid rocks. In the field, this species is very difficult to distinguish from Porpidia platycarpoides that is more coastal, K+ yellow to red and P+ yellow, and from Porpidia crustulata of which the apothecia are smaller an the exciple thinner. N.B.  It is highly probable that many taxa are brought together under this name since this species is extremely variable.*







Porpidia macrocarpa Porz Gwen
Alain GERAULT



Porpidia macrocarpa Pointe des espagnols
Alain GERAULT



Porpidia macrocarpa Morgat
Bernard BOUFFINIER



Porpidia macrocarpa Monthermé 1
Jacques HAINE



Porpidia macrocarpa Monthermé 2
Jacques HAINE



Porpidia macrocarpa Lostmarc'h
Michel DAVID



Porpidia macrocarpa Audierne
Bernard BOUFFINIER



Porpidia macrocarpa Commana
Bernard BOUFFINIER



Porpidia macrocarpa Roscanvel La Fraternité 1
Jacques HAINE



Porpidia macrocarpa Roscanvel La Fraternité 2
Jacques HAINE



Porpidia macrocarpa Réaction à KOH Roscanvel La Fraternité 3
Jacques HAINE



Porpidia macrocarpa Coupe apothécie KOH Roscanvel La Fraternité 4
Jacques HAINE



Porpidia macrocarpa Asque KOH & Bleu Coton Roscanvel La Fraternité 5
Jacques HAINE



Porpidia macrocarpa Asque Lugol Roscanvel La Fraternité 6
Jacques HAINE



Porpidia macrocarpa Spores et paraphyses KOH & Bleu Coton Roscanvel La Fraternité 7
Jacques HAINE



Porpidia macrocarpa Spores Lugol Roscanvel La Fraternité 8
Jacques HAINE



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