The fine structure of resting mycelium of Verticillium albo-atrum R. & B.

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Abstract
Hyphae of V. albo-atrum underwent morphological changes resulting in the death, by autolysis, of about 90% of the hyphae comprising the colony. The remaining hyphae became vacuolate and exhibited an increase in endoplasmic reticulum and mitochondria and extruded melanizing particles through the thickened cell wall to give rise to resting mycelium. These observations are characteristic of the fungus. Resting mycelium resulted from a modification of single, unbranched hyphae and not from repeated budding of single or contiguous hyphae. This confirms that V. albo-atrum is morphologically distinct from the microsclerotial form of the genus.

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