Synonymy of Ejectosporus magnus and Simuliomyces spica, and a new species, Ejectosporus trisporus, from winter-emerging stoneflies

Abstract

The Trichomycete, Ejectosporus magnus, from Allocapnia spp. was determined to be a vegetative spore stage of another harpellid, Simuliomyces spica. A voucher slide of E. magnus made from a stonefly nymph that was part of the same collection as the holotype had thalli bearing trichospores of both E. magnus and S. spica. I conclude that these are one species; therefore Ejectosporus is emended and the species is treated as E. spica. Also, a new species, E. trisporus, is described from Allocapnia pygmaea (Plecoptera: Capniidae) collected in eastern Canada. This species has vegetative spores and trichospores with characteristics similar to E. spica, but the two species are separated by differences in zygospore sizes.