The ultrastructure of the Spilocaea state of Venturia inaequalis in vivo

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Abstract
There are indications that the fungus enzymatically degrades the cuticle and epidermal cell wall [of crab apple, Malus cv. ''Hopa'']. The epidermal cells and to a lesser degree the palisade mesophyll cells beneath a sporulating lesion (susceptible reaction) are killed or seriously disrupted. Various stages of conidiogenesis, including development of the primary conidium, were observed. A conidium is delimited by a 2 layered transverse septum. Before conidium secession, a new 2 layered inner wall is laid down around the entire conidiogenous cell adjacent to the plasmalemma. The apical region of the new inner wall proliferates beyond the annellation scar left by the seceded conidium and eventually produces another conidium.

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