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Nuclear division in O. cardiacum is described. Before division, the nucleusenlarges considerably. At prophase, the nucleolus starts dispersing and kinetochoresappear on the condensing chromatin, situated and oriented apparently at randomin the nucleus. By prometaphase, the kinetochore pairs become aligned along thespindle axis before moving into the metaphase-plate configuration; this supportsan earlier theory explaining metakinesis. During prophase and metaphase particularly,the nuclear envelope at the poles forms channels that extend for some distanceinto the cytoplasm; these may also bifurcate. The nucleolus disperses but remains inthe intranuclear spindle throughout division as a loosely knit skein of granularmaterial. The kinetochores have a complex structure, up to seven distinct layersbeing detectable; the kinetochore pairs split, and then migrate polewards at anaphasewith the rest of the chromosome trailing behind. Large numbers of microtubulesrun from the kinetochore into evaginations of the nuclear envelope whichincrease in size during anaphase. The spindle grows in length considerably duringanaphase, this coinciding with a proliferation of interzonal microtubules, first seenamongst the trailing chromosome arms. The nuclear envelope enclosing the spindlebecomes severely stretched at this stage; it contracts closely around each of thedaughter nuclei, isolating them from the rest of the spindle (including microtubulesand the remains of the nucleolus). The spindle then collapses; the nuclei come togetherand then flatten against one another; between them, vesicles and othercomponents of the septum collect amongst a large number of transversely orientedmicro tubules.

Cell Division in Oedogonium II. Nuclear Division in O. Cardiacum