Chrysosporium vespertilium sp. nov. is described and illustrated and i
ts relationships to the other species of Chrysosporium are briefly dis
cussed. The species is characterized by having typically yellow coloni
es and long and coiled sterile hyphae; fertile hyphae are warty, frequ
ently constricted at septa and branching orthotropically. Conidia are
clavate to cylindrical, yellowish and verrucose.