Delimitation of Fusarium crookwellense macroconidia

Delimitation of second and subsequent Fusarium crookwellense macroconidia, determined by means of TEM and SEM, appeared to occur in the absence of a well-defined, double-layered septum produced by invagination of the inner wall layer of the conidiogenous cell. Rather, the delimiting layer appeared to be continuous with the inner wall layer of the maturing conidium. Repeated production of conidia resulted in a build-up of proliferation layers (periclinal thickening) leaving a small translocation channel. At this stage the conidiogenous cells could regenerate themselves by means of percurrent proliferation.