. Fundamentals of botany. Botany. Fig. 299.—Cycas revoluta. a, Pollen grains at shedding stage; X 500; 6, later stage, showing prothallial cell {p) and generative cell (g), the tube- nucleus not shown; X 200; c, generative cell divided, giving rise to stalk- and body-cells; X 500; d, the stalk-cell-nucleus (s) being crowded out, and blepharoplasts appearing in the body cell (6); X 500; e, the body-cell shortly before division, showing two well-developed blepharoplasts; X 750; /, the two male cells resulting from the division of the body-cell; the beaks of the nuclei are attached to the cilia-b
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. Fundamentals of botany. Botany. Fig. 299.—Cycas revoluta. a, Pollen grains at shedding stage; X 500; 6, later stage, showing prothallial cell {p) and generative cell (g), the tube- nucleus not shown; X 200; c, generative cell divided, giving rise to stalk- and body-cells; X 500; d, the stalk-cell-nucleus (s) being crowded out, and blepharoplasts appearing in the body cell (6); X 500; e, the body-cell shortly before division, showing two well-developed blepharoplasts; X 750; /, the two male cells resulting from the division of the body-cell; the beaks of the nuclei are attached to the cilia-bearing bands; X 200. Reduced about two-thirds in reproduction. (After Ikeno.) pollen. This is also a new feature in life history. In ger- mination the pollen-grain develops absorbing organs (haustoria), which penetrate the tissue of the nucellar-cap (Fig. 300), and also larger tubes which carry the generative cell further down into the pollen-chamber. As the tube. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Gager, C. Stuart (Charles Stuart), 1872-1943. Philadelphia, P. Blakiston's son & co.