Français English

Zwackhia prosodea (Ach.) Ertz

Synonyms:

Opegrapha taxicola Leight.

Opegrapha prosodea Ach.

Opegrapha viridis var. taxicola (Leight.) Leight.



Family: ROCCELLACEAE

Habitat: Oceanic zone

Description

    Thallus crustose, thin to very thin, smooth or minutely cracked, pale grey, dull white, grey-whitish, sometimes pale brown-olive tinged with green, seldom brown. Apothecia lirellate, fissure narrow and width stable during maturation, numerous, rather sessile, as laying on the thallus surface, short, straight or curved, seldom branched, 1-3 x 0.2-0.3 mm, black without pruine. Ascii 8-spored, 80-110 x 15-20 µm according to our measures. Ascospores acicular, colourless, straight or very slightly curved, 8-14 septate, surrounded with a gelatinous perispore, 50-70 x 6-8 µm according to literature, 40-65 x 7-8 µm according to our measures. Chemical spot tests negative. Rare, oceanic species associated with dry bark of old Quercus, seldom of old Taxus, notably within chapel enclosures, almost always (at least for oaks) together with Schismatomma decolorans. Cf. Zwackhia viridis very similar although its thallus is more brownish or olive and its apothecia half-immersed and growing on smooth and humid bark of young deciduous trees.







Zwackhia prosodea avec Roccella phycopsis sur Quercus Plougastel-Daoulas 1
Jacques HAINE



Zwackhia prosodea sur Quercus Plougastel-Daoulas 2
Jacques HAINE



Zwackhia prosodea Coupe apothƩcie Plougastel-Daoulas 3
Jacques HAINE



Zwackhia prosodea Asque Eau Plougastel-Daoulas 4
Jacques HAINE



Zwackhia prosodea Asque Bleu Coton Plougastel-Daoulas 5
Jacques HAINE



Zwackhia prosodea Asque Lugol Plougastel-Daoulas 6
Jacques HAINE



Zwackhia prosodea Spores Eau Plougastel-Daoulas 7
Jacques HAINE



Zwackhia prosodea Spores Bleu Coton Plougastel-Daoulas 8
Jacques HAINE



Zwackhia prosodea Spores Lugol Plougastel-Daoulas 9
Jacques HAINE



Zwackhia prosodea Plougastel-Daoulas 10
Joƫl QUERELLOU



Zwackhia prosodea Plougastel-Daoulas 11
Joƫl QUERELLOU



Zwackhia prosodea Plougastel-Daoulas 12
Joƫl QUERELLOU



Zwackhia prosodea Plougastel-Daoulas 13
Joƫl QUERELLOU



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