Abstract
Macroconidia of F. culmorum (W. G. Sm.) Sacc. are sheathed in a wall composed of two zones. The possible developmental sequence of the wall is outlined. Macroconidia become structurally modified when incubated at a range of temperatures in nutrient solution containing varying concentrations of sucrose and inorganic nitrogen. Segments of the macroconidia swell and develop large quantities of endoplasmic reticulum and many mitochondria. Secondary wall material is laid down between the plasmalemma and the conidial wall. At maturity the swollen cells become highly vacuolate and, at this stage, secondary wall deposition ceases. In old chlamydospores the original conidial wall ruptures, remaining as a fragmented layer external to the secondary wall.
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