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Opegrapha vermicellifera (Kunze) J. R. Laundon

Synonyms:

Family: OPEGRAPHACEAE

Habitat: Ubiquitous

Description

    Thallus crustose, to 8-12 cm across, smooth or minutely rimose, pale grey, grey-whitish, fertile form grey-ochre but most often sterile and then whitish, pale grey, covered with pycnicia, regularly distributed, immersed at first and appearing as black or brown-black ostioles, later as white, pruinose papillae or minute warts; scratches on the thallus induce orange stripes (Trentepohlia). Fertile form rather rare, lirellae confined to restricted areas on the thallus, lirellae to 0.1-0.15 mm wide, isolated, most often simple, but potentially furcate or stellate in small clusters, disc slit-shaped, greyish and pruinose. Ascospores markedly elongate with pointed ends, 5-septate, 15-25 x 3-4 µm. Thallus and pycnidia pruine: C-, K-, KC-, Pd-. On dry sides of barks of trees in humid woodlands and forests. The sterile form is the most common and very similar to the sterile form of  Lecanactis abietina of which the pycnidia are larger, C+ red, K- pruine, and also to Lecanactis subabietina with C- and pale yellow K+ pruine.*







Opegrapha vermicellifera Ardennes 1
Jacques HAINE



Opegrapha vermicellifera Ardennes 2
Jacques HAINE



Opegrapha vermicellifera La Palue 1
Bernard BOUFFINIER



Opegrapha vermicellifera ForĂȘt du Cranou 1
Joël QUERELLOU



Opegrapha vermicellifera ForĂȘt du Cranou 2
Joël QUERELLOU



Opegrapha vermicellifera ForĂȘt du Cranou 3
Joël QUERELLOU



Opegrapha vermicellifera Pycnides ForĂȘt du Cranou
Joël QUERELLOU



Opegrapha vermicellifera La Palue 2
Bernard BOUFFINIER



Opegrapha vermicellifera La Palue 3
Bernard BOUFFINIER



Opegrapha vermicellifera La Palue 4
Bernard BOUFFINIER



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