. Carnegie Institution of Washington publication. FIG. 68.—Pollen grain, end of pollen tube, and fusion nucleus of Pinus stroiius.—(After Ferguson.) A, mature pollen grain. /' and/', remains of first and second prothallial cells; a. c., antheridial cell. B, pollen grain in which antheridial cell has divided. £.c., generative cell; , stalk cell. C, distal end of pollen tube which is pushing between neck-cells of archegonium ; the male nuclei () are of unequal size, , tube nucleus ; , stalk cell; , cytoplasm of generative cell. D, first mitosis following fecundation.
. Carnegie Institution of Washington publication. FIG. 68.—Pollen grain, end of pollen tube, and fusion nucleus of Pinus stroiius.—(After Ferguson.) A, mature pollen grain. /' and/', remains of first and second prothallial cells; a. c., antheridial cell. B, pollen grain in which antheridial cell has divided. £.c., generative cell; , stalk cell. C, distal end of pollen tube which is pushing between neck-cells of archegonium ; the male nuclei () are of unequal size, , tube nucleus ; , stalk cell; , cytoplasm of generative cell. D, first mitosis following fecundation. The spindle is formed, but the male and female chromatin spirems are still separate and distinct. Pinus strobus, according to Ferguson, there are probably instances in which the nucleus of this cell is not reconstructed, and this may be true also in other genera and 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 Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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