Oidiodendron griseum Robak: an endophyte of ericoid mycorrhiza in Vaccinium spp

Osmium tetroxide was used to sterilize the surface of roots of Vaccinium angustifolium and V. corymbosum in order to isolate mycorrhizal fungi. Three isolates of sterile mycelium, all of similar cultural appearance, were obtained from V. angustifolium and were proved capable of forming ericoid mycorrhizas under aseptic conditions. Three isolates were also obtained from V. corymbosum and all formed conidiophores identified as Oidiodendron griseum Robak; they also formed ericoid mycorrhizas under aseptic conditions.