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Mycoparasitic Relationships: Gonatobotrys simplex Parasitic on Alternaria tenuis. H. C. Hoch, Department of Plant Pathology, New York State Agricultural Experiment Station, Cornell University, Geneva, NY 14456; Phytopathology 67:309-314. Accepted for publication 15 September 1976. Copyright 1977 The American Phytopathological Society, 3340 Pilot Knob Road, St. Paul, MN 55121. All rights reserved.. DOI: 10.1094/Phyto-67-309.

Ultrastructural detail of the host-parasite interface of a biotrophic contact mycoparasitic relationship involving Alternaria tenuis and Gonatobotrys simplex is presented. Membrane-lined plasmodesmata traverse the wall between the two fungi and thus provide intimate cytoplasmic contact. The wall of the host, A. tenuis, at the contact interface is thickened; the wall of G. simplex either was not resolved by the preparative and micrographic techniques or it is absent. The contact cell of G. simplex is separated from the main hypha of G. simplex either by an occluded septal pore surrounded by Woronin bodies or by a septum with an open pore.