. An introduction to vegetable physiology. Plant physiology. EEPEODUCTION 435 In the seeds of "the Gymnosperms the endosperm repre- sents the prothallium or gametophyte. The formation of the seed we have seen to depend upon the fusion of the sexual cells or gametes. This process is a very widespread one and is the starting point of the development of the young sporophyte in all plants. Fig. 180.—Antherozo'ids of Moss (a) and Feen (b). above the Thallophytes. The mode of bringing the gametes together varies with the habit of life of the plant. Where the male gamete is a motile antherozo'id
. An introduction to vegetable physiology. Plant physiology. EEPEODUCTION 435 In the seeds of "the Gymnosperms the endosperm repre- sents the prothallium or gametophyte. The formation of the seed we have seen to depend upon the fusion of the sexual cells or gametes. This process is a very widespread one and is the starting point of the development of the young sporophyte in all plants. Fig. 180.—Antherozo'ids of Moss (a) and Feen (b). above the Thallophytes. The mode of bringing the gametes together varies with the habit of life of the plant. Where the male gamete is a motile antherozo'id it makes its way to the oosphere by means of its cilia, which enable it to swim freely in water. In those forms with a terrestrial habit, such as the Bryophyta and Pteridophyta, in which the antherozoid is ciliated (fig. 180), fertilisation can only be. 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 Green, J. Reynolds (Joseph Reynolds), 1848-1914. Philadelphia, P. Blakiston
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