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MITOSIS AND CLAMP FORMATION IN THE FUNGUS

A B S T R A C T Ntuclear division in P. monticola is in general similar to mitosis in higher organisms. Synchronous division of the nuclei in the dikaryon progresses with clamp development. Mitosis begins with the movement of the centriolar plaques into and under the forming clamp. The pull of the centriolar plaque on the attached nucleolus forms a long strand of nucleolar mateiial. Chromosomes now appear as dense granules at the end of the nucleus proximal to the clamp. At this time the nucleolus moves adjacent to the centiiolar plaque and contracted chromosomes. The nuclear membrane at least partially disintegrates, and the nucleolus is released into the cytoplasm where it may persist through telophase. A faintly staining spindle is often observed, and it produces a "double bridge" effect in separating chromatin. Somatic chromosomes are attached togethei foiming strings that appear double and at least partially separated before metaphase.