Abstract
The vegetative hypha, septum formation and structure, and the yeast-phase (Y-phase) ofCokeromyces recurvatus have been studied by means of light microscopy and electron microscopy. The septum originates by centripetal folding of the plasmalemma and the deposition of primary wall material within the fold. Secondary wall material is deposited on each face of the primary wall. The crosswall, traversed by many plasmodesmata, may develop a central fibrillar elaboration resembling that observed in papilla material formed during the response to attack by mycoparasites. The blastosporic Y-phase cell has a fibrillar, multilamellate, relatively thick wall. Reversion to the mycelial phase occurs when Y-phase cells are plated onto the surface of malt extract agar. The wall of the germ hypha, which originates as a tapered layer internal to the wall of the Y-phase cell breaks through the Y-phase wall at emergence. A septum usually develops in the germ tube in the region of exit from the Y-phase cell.
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