“Stages in the division of a grandmother cell of microspores or pollen grains of a lily, somewhat diagrammatic. 14, split chromosomes of 13 aligned at the equator ready for the longitudinal halves of each to be drawn apart to opposite poles.” -Stevens, 1916
William Chase Stevens Plant Anatomy (Philadelphia, PA: P. Blakiston, 1916)
2070×2400, 1.2 MiB
883×1024, 136.4 KiB
552×640, 71.9 KiB
276×320, 30.4 KiB