FINE STRUCTURE OF MICROSCLEROTIA OF VERTICILLIUM ALBO-ATRUM REINKE & BERTH.

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Abstract
The fine structure of microsclerotia of Verticillium albo-atrum Reinke & Berth. is described. Fixing and embedding procedures are given. Microsclerotial units are composed of thin- and thick-walled cells in close association with each other. The larger thick-walled cells contain different cytoplasmic inclusions and food vacuoles, while the smaller thin-walled cells contain nuclei or look empty. Only the thin-walled cells are found to germinate. The thick-walled cells, with their stored food, appear to serve a double role of protection of, and as a source of, food for the thin-walled cells.