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Abstract
The cell wall of hyphae of Thielaviopsis basicola consisted of an inner transparent layer and an outer electron-dense layer. The cell wall of the endoconidia was usually composed of a single transparent layer; at the tip of the endoconidia distal from the phialide the cell wall protruded into the cytoplasm. Hyphal tubes that contained endoconidia were devoid of cytoplasmic components. The only cytoplasmic component recognizable in the phialide was the endoplasmic reticulum. Two complex cell-wall systems were observed in chlamydospores. An outer cell wall enclosed the whole chlamydospore and each individual compartment possessed its own separate cell wall. Both cell walls were composed of an outer very electron-dense layer and an inner layer which appeared to be electron-transparent.
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