Family: Celotheliaceae Species: Celothelium ischnobelum Q Growth type crustose Photos: On Hazel (Corylus), Dromore, Co. Cork, SW Ireland. Identification uncertain 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 Q. July 2024