Family: Celotheliaceae Species: Celothelium ischnobelum Growth type crustose. Photos: On Hazel (Corylus) Thallus greenish-white, pale yellow or cream-coloured, smooth and continuous and sometimes with a dark brown prothallus. The black, shiny perithecia are scattered or in small clusters, immersed then projecting, hemispherical to flattened. Asci 8-spored, thread-like spores are 8 to many-septate, hyaline, 80-110 x 1.5-2.5 µm and sometimes twisted in the asci. Pycnidia immersed then projecting, macroconidia multiseptate, 60-100 x 1.5-2 µm. Micrographs below On smooth bark in sheltered, humid situations, most frequent on Corylus and Ilex. Doubtfully lichenised but associated with trentepohlioid algae below the surface

Microscope photograph



Celothelium ischnobelum