Français English

Porpidia platycarpoides (Bagl.) Hertel

Synonyms:

Family: PORPIDIACEAE

Habitat: Aerohaline zone

Description

    Thallus crustose, markedly granulose to areolate, areoles more or less convex, minutely papillate or verrucose, whitish to pale ash-grey, prothallus often inconspicuous, blackish to greyish. Apothecia scattered, usually scarce, sessile to slightly immersed in the thallus, 0.5-3 mm diam., disc flat to convex, sometimes umbonate, black, occasionally with a white pruine turning its colour to greyish, exciple thick, swollen, smooth. Ascospores simple, egg or tear-shaped, 15-25 x 7-11 µm according to literature, 15-23 x 8-10 µm according to our measures. Medulla: C-, K+ yellow to red, Pd+ yellow; exciple cross-section: K+ yellow to red. Photobiont: Clorococcoid. Maritime trends, on acids rocks. N.B. Very difficult to distinguish in the field from Porpidia macrocarpa specimen with greyish thallus, and most often apothecia cross-sections are required to proceed to the K reaction. Porpidia cinereoatra has much smaller apothecia, more or less immersed in the thallus and scattered over the areoles, markedly delimited by a black prothallus.







Porpidia platycarpoides Pointe de Tréberon 2
Bernard BOUFFINIER



Porpidia platycarpoides Fraternité 2
Alain GERAULT



Porpidia platycarpoides Pointe de Tréberon 1
Bernard BOUFFINIER



Porpidia platycarpoides Roscanvel 2
Jacques HAINE



Porpidia platycarpoides Pointe du Raz 2
Bernard BOUFFINIER



Porpidia platycarpoides Roscanvel 1
Jacques HAINE



Porpidia platycarpoides Le Fret 2
Bernard BOUFFINIER



Porpidia platycarpoides Pointe du Raz 5
Bernard BOUFFINIER



Porpidia platycarpoides Pointe du Raz 6
Bernard BOUFFINIER



Porpidia platycarpoides Réaction au K marge apothécie Roscanvel 3
Jacques HAINE



Porpidia platycarpoides Asque eau Roscanvel 4
Jacques HAINE



Porpidia platycarpoides Asque Bleu Coton Roscanvel 4
Jacques HAINE



Porpidia platycarpoides Spores eau Roscanvel 6
Jacques HAINE



Porpidia platycarpoides Spores Bleu Coton Roscanvel 7
Jacques HAINE



Porpidia platycarpoides Le Fret 1
Bernard BOUFFINIER



Porpidia platycarpoides Fort des Capucins 2
Bernard BOUFFINIER



Porpidia platycarpoides Fort des Capucins 3
Bernard BOUFFINIER



Return
Content : Alain Gérault - Website development : Sylvain Ard - Hosting : Online.net