Ultrastructure of the Haustorial Apparatus of Dimargaris cristalligena

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Abstract
Infection of the reference host, Cokeromyces recurvatus by Dimargaris cristalligena was studied by means of light and electron microscopy. Morphologically, the infection apparatus comprised an appressorium, a septate neck region with a collar and a nucleate lobed region separated from an extrahaustorial membrane by a boundary layer continuous with the wall of the parasite. An electron-opaque penetration jacket was formed during initial stages of infection and also in cases of apparent ‘self-parasitism’. Reactions of the host to infection are described, and cytological findings are related to current knowledge of host infection by haustorium-producing parasitic fungi.