Abstract
Ultrastructural studies of the hyphae of Stereum hirsutum antagonized by Hypomyces aurantius in mycelial interaction zones showed severe disruption of the internal structure and organization. Typically antagonized hyphae contained deposits of electron-dense material, large vacuoles and many lipid bodies. Frequently contents were seen shrunken within the hyphae although hyphal walls remained intact. This condition was seen to develop progressively in Coriolus versicolor hyphae in contact with H. aurantius diffusates through the early accumulation of lipid bodies followed by the swelling of mitochondria and the cisternae of the endoplasmic reticulum, the appearance of perinuclear spaces and the shrinkage of the plasmalemma from the hyphal wall. Later many membrane-bound vacuoles were seen, and evidence was obtained which confirmed that many of these arose by the solubilization of the contents of the mitochondria.
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