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Abstract
The parasitic interaction of Tremella mesenterica, T. encephala and T. mycophaga was studied by light and electron microscopy. The host range of T. mesenterica was tested with Peniophora laeta, Peniophora incarnata, Phlebia radiata, Schizopora paradoxa, Stereum hirsutum and Diatrype stigma. It was demonstrated that T. mesenterica is, at least in vivo, a mycoparasite of the corticiaceous homobasidiomycete Peniophora laeta. Specialized interactive cells of T. mesenterica, T. encephala and T. mycophaga, designated as tremelloid haustorial cells with haustorial filaments, penetrated the cell walls of their respective hosts. A single micropore connected the cytoplasm of the haustorial filament with that of the host cell. The pore membrane appears to be continuous with the plasmalemma of both cells. In older interaction structures, the micropore was often overgrown on the host side by secondary wall formation. In vitro such micropores were present in the interaction of T. mesenterica with Peniophora laeta, P. incarnata and Phlebia radiata but could not be found in the interaction of T. mesenterica with Schizopora paradoxa, Stereum hirsutum and Diatrype stigma. However, only in Peniophora laeta and P. incarnata was the pore domain delimited by a more or less circular arrangement of ER cisternae. Wall thickening may be responsible for the nonmicropore interaction.