Abstract
The fine structure of the macroconidium of Fusarium culmorum (W. G. Smith) Sacc. is described. The presence of a mucilaginous coat around the conidium and its expansion during germination are confirmed. Studies of germinating conidia have shown changes in the numbers of organelles. The germ tube is shown to be formed from an entirely new wall laid down in the conidium, and the emergence of the germ tube is brought about by lysis of the original condial wall.