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Six species of Triceromyces (Laboulbeniales), including the type, T. balazucii (on Hebridae), parasitic on semiaquatic Hemiptera, were studied at the light-microscopic level. Descriptions are provided for all of the taxa, and features of developmental morphology are described, compared, and illustrated with photographs and line drawings. Four species are described as new: T. hebri (on Hebridae), T. hydrometrae (on Hydrometridae), and T. biformis and T. bullatus (on Mesoveliidae). The species growing on Hebridae and Hydrometridae are monoecious. The two species on Mesoveliidae develop monoecious and dioecious morphs, which occur together on the same host individual. This phenomenon is recognized and described for the first time in the Laboulbeniales. Two species, Autophagomyces poissonii and Dioicomyces mesoveliae, previously described from a species of Mesoveliidae, are shown to represent the monoecious and dioecious forms of a species of Triceromyces and are transferred to this genus as T. poissonii. Speculations on the origin of dioecism in the Laboulbeniales are reviewed and discussed briefly without, in the absence of experimental evidence, reaching positive conclusions.

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© 1986 Richard K. Benjamin

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