Abstract
The ultrastructural development of asci, ascospores and centrum organization in Ophiostoma davidsonii , was examined. Mechanisms possibly involved in ascospore wall and sheath development, revealed differences between O. davidsonii and Ceratocystis moniliformis . Ascospore delimitation commenced with the formation of double delimiting membranes. The prismatic and spindle-shaped ascospores developed individually, not in pairs as in C. moniliformis and C. fimbriata . Asci of O. davidsonii were arranged in a cluster at the perithecium base whereas in C. moniliformis asci line the innermost surface, except the ostiole region.
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