Ophiognomonia is a genus of fungi in the family Gnomoniaceae.
Sacc., occurs on overwintered leaves and petioles of Tilia spp.
Two of these species are known as endophytes of woody plants, O. cryptica D. Wilson & M.E.
Barr isolated from leaves of Quercus emoryi and O. elasticae (Koord.)
Although O. cryptica is a dominant endophyte with interesting ecological implications, no living isolates of this species have been preserved.