Harpella leptosa, a new species of Trichomycetes substantiated by electron microscopy

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Abstract
Harpella leptosa (Harpellales, Harpellaceae) from the midget region of blackfly larvae (Simuliidae) is described. With the light microscope it is distinguished from the only known species of the genus, H. melusinae, primarily by its smaller dimensions and less conspicuous holdfast, but electron microscopic studies reveal significant differences in the substructure of the trichospore appendages and holdfast apparatus. Harpella leptosa is presently known only from the northern Rocky Mountains. The two species of Harpella are sympatric, and occasionally live simultaneously in the same host gut.

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