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Images of British Lichenicolous Fungi

Abrothallus welwitschii Mont. ex Tul.

Ascomycota, incertae sedis: apothecia black, emarginate (lecideoid), convex, surface somewhat rugose, arising directly on the host thallus, ascospores brown, 1-septate; anamorphic stage Vouauxiomyces, black pycnidia, set in the host surface. Parasitic on Sticta spp.

Refs: Hawksworth (1983), 20 (as A. parmeliarum, in part); Diederich in Nash et al. (2004), 629.

Abrothallus welwitschii on Sticta limbata
Abrothallus welwitschii on Sticta limbata
Black apothecia on Sticta limbata, Stackpole, Pembrokeshire, May 2009. Note that the whitish, powdery areas are the soredia of the host.

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© A.J. Silverside
Uploaded December 2009, last updated March 2013