The fine structure of conidium initiation in Ulocladium atrum

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Abstract
Synchronous conidiation was induced in pure cultures of Ulocladium atrum by removal of a dialysis membrane overlay beneath which vegetative mycelium had been allowed to grow for 24 h on a solid nutrient agar medium. Samples taken [Formula: see text] and 6 h after the induction of sporulation contained numerous conidiophores with conidial initials in the very earliest stages of formation. Examination of sections of such conidiophores with the electron microscope revealed no suggestion of a discontinuity in the wall between the conidiophore and the conidial initial. We conclude that conidiation in Ulocladium atrum is holoblastic.

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