. Plant anatomy from the standpoint of the development and functions of the tissues, and handbook of micro-technic. B C FIG. 123.—Formation and separation of chromosomes in the spore grandmother cellsof Osmunda cinnamomea. .4, a, early prophase showing approximation of nuclear threadin parallel strands; b, detail more highly magnified; B, later prophase showing transversedivision of double thread, forming pairs of chromosomes; d, two pairs of chromosomesfrom c more highly magnified; C, e, metaphase showing separation of the members of thechromosome pairs;/, late anaphase showing that each chro
. Plant anatomy from the standpoint of the development and functions of the tissues, and handbook of micro-technic. B C FIG. 123.—Formation and separation of chromosomes in the spore grandmother cellsof Osmunda cinnamomea. .4, a, early prophase showing approximation of nuclear threadin parallel strands; b, detail more highly magnified; B, later prophase showing transversedivision of double thread, forming pairs of chromosomes; d, two pairs of chromosomesfrom c more highly magnified; C, e, metaphase showing separation of the members of thechromosome pairs;/, late anaphase showing that each chromosome is longitudinally description in the text. (After Yamanouchi.) through the middle (Fig. 123, C,/), and that the halves spreadapart at their equatorial ends while remaining together at theirpolar ends. At the poles these longitudinally-split chromosomes branchout more or less into a reticulum and a nuclear membrane isformed; but soon the second division is begun, the split chromo-somes become again recognizable, and give evidence by thisfact that they had preserved their identity through
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