Abstract
Sporulation, septal pore apparatus and host-parasite interaction between Ustilago osmundae and its host, the royal fern, were analyzed by light and electron microscopy using herbarium material and compared with findings in other species of Basidiomycota. The fungus produced thick-walled and thin-walled hyphae on leaf surfaces and sporulated externally. Coralloid haustoria with numerous lobes were present only in epidermal cells. Hyphae in intercellular spaces were lacking. The septal pore apparatus was composed of a simple pore with two caps. Ustilago osmundae shares the type of septal pore apparatus and host-parasite interaction with the Melanotaeniaceae of Ustilaginomycetes. It differs from the other species of this family primarily in the external sporulation and in the lack of intercellular hyphae. To accomodate this unusual fungus in Melanotaeniaceae a new genus, Exoteliospora, is proposed. Description and illustrations are given for Exoteliospora osmundae.
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