A NEW MONOTYPIC FUNGAL GENUS, ALLANTOMYCES, AND A NEW SPECIES OF LEGERIOMYCES (TRICHOMYCETES, HARPELLALES) IN THE HINDGUT OF A WESTERN-AUSTRALIAN MAYFLY NYMPH (TASMANOCOENIS SP)

Allantomyces caenidarum sp.nov., a trichomycete fungus that lives in t he hindgut of Tasmanocoenis sp. (Caenidae) mayfly nymphs in southweste rn Western Australian streams, is described. In addition to normal tri chospores and zygospores that serve to reinfest other nymphs, A. caeni darum also produces what may be modified trichospores that serve to in crease gut infestation endogenously. The same species of mayfly also h arbored a new species, Legeriomyces rarus, which belongs to a genus pr eviously known only from North America and Europe.