. Botany of the living plant. Botany; Plants. : Tin-. .-< irrs pine 533 As these project at the time of pollination above the end of the • tending shoot, they arc in the best possible position for receiving I wind-borne pollen. The male flower is enveloped below by niembr scales, and bears distally numerous sporophylU or stamen:. h with. Fig. 420. Pinus nigra, Arnold. Shoot bearing mak (lowers in place of 1 spurs. (After Groom.) two pollen-sacs on its under side (Fi-. 4-f, BtC). Th< pollen-grains are peculiar in bearing right and left of the grain itself air-containing sacs (w
. Botany of the living plant. Botany; Plants. : Tin-. .-< irrs pine 533 As these project at the time of pollination above the end of the • tending shoot, they arc in the best possible position for receiving I wind-borne pollen. The male flower is enveloped below by niembr scales, and bears distally numerous sporophylU or stamen:. h with. Fig. 420. Pinus nigra, Arnold. Shoot bearing mak (lowers in place of 1 spurs. (After Groom.) two pollen-sacs on its under side (Fi-. 4-f, BtC). Th< pollen-grains are peculiar in bearing right and left of the grain itself air-containing sacs (wings) which give a low specific gravity to the whole grain, and so aid its transfer by the breeze (Fig. 421, D). At the tunc when r shed, the grain of Pinus , in addition to the vestigial remains of two obliterated cells of the male prothallus, one nucleated cell. 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 Bower, F. O. (Frederick Orpen), 1855-1948; Wardlaw, C. W. (Claude Wilson), 1901-. London, Macmillan and Co. , ltd.
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