Zygopolaris, a New Genus of Trichomycetes Producing Zygospores with Polar Attachment

Abstract
A new monotypic genus of the fungal order Harpellales (Genistellaceae) was found in 3 localities in the USA inhabitating the guts of mayfly nymphs, Ephemerella and Baetis. Mature sporulating thalli of ZYGOPOLARIS ephemeridarum sp. nov. could be found protruding from the the anus of the host into the aquatic environment. Released trichospores did not appear to have basal appendages, as do most other Harpellales, but evidence of rudimentary appendage formation was found in the generative cells. Zygospores were attached at one pole, and resembled those of Carouxella (Harpellaceae). The similarities of the 2 genera and 2 families were discussed, as well as the 4 types of zygospores recognized in the Harpellales.

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