Zygospores of the Harpellales: an ultrastructural study

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Abstract
Structure of zygospores, their zygosporophores, and conjugants in Harpella melusinae, Trichozygospora chironomidarum, Genistellospora homothallica, and Zygopolaris ephemeridarum is described from light and transmission electron microscope studies. Possession of a thickened wall, presence of storage materials, and formation after hyphal conjugation supports the interpretation of these as zygospores. The relationship of the harpellaceous zygospores to those of other members of the Zygomycotina is discussed.