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ABSTRACT
Ascocarp ontogeny of Chaetomium malaysiense was studied by means of scanning electron microscopy (SEM). Ascoma development begins when a side branch of a vegetative hypha coils about itself spirally or in an irregular way forming a sessile or slightly stalked ascogonium. The enveloping hyphae that appear shortly after, surround and envelop the ascogonium. Subsequently, ascoma differentiation in C. malaysiense is divided into 4 development stages. Each is associated with cellular adhesion before another reorganization takes place to originate the next developmental stage. Throughout all developmental stages, growth and differentiation seem mainly due to the meristematic character of the hyphal distal ends at the apical part of the ascoma. Hyphal cohesion and extracellular material seem to play a major role in ontogeny. The ostiolar canal probably originates by lysis of the most internal cells in the early stages. Enlargement of the peridial cells that surround the ostiolar pore forms hair-like appendages that elongate and adhere, giving rise to a pronounced neck. The significant length of this neck together with its positive phototropic character, facihtate ascospore dispersion.
