Abstract
The ultrastructure of perithecium, ascus and ascospore development in Ceratocystis moniliformis was studied and compared with that of other Ascomycetes. Ascospore formation was preceded by the synthesis of delimiting wall structures, associated with membranes. These coalesced to form an ascus vesicle surrounding eight nuclei. The vesicle wall invaginated to form lobes or sac-like structures enclosing each nucleus. Each young ascospore was paired on one side with a second ascospore. The walls differentiated to form brim appendages at the flattened sides of the paired ascospores. Furthermore, the walls developed into two layered hat-shaped sheaths. A third allantoid wall layer was formed towards the inside of the sheath apparently by lomasomes from within the ascospore. Auxiliary cells attached to developing asci and ascospores could function in supplying additional wall material and nutrients during spore development. The ultrastructure of C. moniliformis is compared with that of C. fimbriata which also has hat-shaped ascospores.
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