Abstract
SUMMARYThe young pillars of Ceratiomyxa fruticulosa are highly vacuolate and contain the usual cytoplasmic organelles including nuclei, mitochondria, microfibers and microtubules. Distinctive structures consisting of dilated rough endoplasmic reticulum containing electron dense globules are found distributed throughout the cytoplasm at this stage. The development of protospores and their ultrastructure are described as well as nuclear divisions, presumably representing meiosis. Mature spores which contain four nuclei, Golgi and centrioles are described. A layer of electron-dense material which is continuous with the stalk surrounds the mature spore. Its taxonomic significance is discussed.
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