40. Ott, D. and R. M. Brown, Jr. 1972.
Light and electron microscopical observations on mitosis in Vaucheria
litorea. Hofman Ed. C. Agardh. British Phycol. J. 7:361-374.
40. Abstract
The light and electron microscopic cytology
of nuclear division in Vaucheria litorea Hofman
ex C. Agardh is described. The interphase nucleus contains
a prominent nucleolus and is associated with lipid droplets.
The nucleus migrates through the coenocytic filament during all
phases of division. During early prophase, the centrioles migrate to each pole,
and the nucleolus fragments. At metaphase, the intra-nuclear spindles, which
consist of continuous and chromosomal
microtubules, are enclosed by a fully intact nuclear envelope.
The nuclear membrane persists throughout the division. Chromosome
separation is accomplished by lengthening of continuous microtubules
at anaphase. Considerable elongation of continuous microtubules
produces an extremely long interzonal spindle between the daughter
nuclei which is ultimately separated at telophase by the invagination
of the inner nuclear membrane and an electron-dense area just
within the abscission zone. Comparisons are made between Vaucheria
and other organisms with a similar mitotic division.