Division of Grandmother Cell Stage 5 Small 275×320 Medium 550×640 Large 881×1024 Download Tiff Original 2064×2400 | (1.7 MB) Description "Stages in the division of a grandmother cell of microspores or pollen grains of a lily, somewhat diagrammatic. 5, double threads so united as to appear as one." -Stevens, 1916 Keywords cell division stage 5, cell division stages, double united threads, grandmother cell division, lily pollen grains, microspores, plant anatomy, plant cells Galleries Cellular Botany Source: William Chase Stevens Plant Anatomy (Philadelphia, PA: P. Blakiston, 1916)