Abstract
Brachymyces is described as a new genus of the Zygomycetes based on a single species, Brachymyces megasporus, isolated from garden soil. This species produces one to four very large blackish-brown conidia at the apex of short, stout, hyaline conidiophores. In contrast to the massive spores, the vegetative hyphae are extremely fine in diameter (ca. 1.0 μm). Hyphae attack rotifers which become filled with broad, convoluted, assimilative hyphae. Neither resting spores nor sexual spores were observed. The fungus appears to be related to Rhopalomyces in the Helicocephalidaceae of the Mucorales.

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