Cyanoannulus Raja, J. Campb. & Shearer, Mycotaxon 88: 8 (2003)
Index Fungorum number: IF28772; 1 species with sequence data.
Type species – Cyanoannulus petersenii Raja, J. Campb. & Shearer
Notes – The monotypic genus Cyanoannulus was isolated from decorticated wood submerged in a stream in North Carolina. The genus is characterised by pale reddish-brown ascomata which are slightly horizontal to the substrate surface, fusoid asci and thick-walled ascospores with a narrow channel at the apices and with a mucilaginous sheath (Raja et al. 2003).