This study was done to compare events of conidiogenesis with previous studies done on the closely related genera Doratomyces and Scopulariopsis. Formation of the first conidium by a T. spiralis annellide was not observed. Conidial initials blew out through the annellide apex, increased in size, and were eventually delimited by centripetally developing septa. Each conidial-delimiting septum subsequently split; the distal layer formed part of the conidial base, and the proximal layer became a portion of the wall of the next conidial initial. A circumscissile rupture of the wall layer continuous between conidium and annellide produced the characteristic annellations and conidial basal frills. Annellations on T. spiralis were more conspicuous than on the two species of Doratomyces and the two species of Scopulariopsis previously studied with electron microscopy. Differences in nuclear behavior and other differences and similarities among the five species were discussed. The term holoblastic to describe conidiogenesis in annellides was questioned.
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