. An introduction to vegetable physiology. Plant physiology. EEPBODUCTION 423 fact suggests that the sexual cells have been derived from asexual ones, and are a later development, therefore, in the history of the race. The more complete differentiation of the gametes into male and female can be observed among several of the families of the Algae. In some species of Ectocarpus and Gutleria the gametes are much like those of Ulothrix, but some are smaller than the others. The larger ones come to rest soonest, and lose their cilia; one of the smaller more motile ones then fuses with each of the l
. An introduction to vegetable physiology. Plant physiology. EEPBODUCTION 423 fact suggests that the sexual cells have been derived from asexual ones, and are a later development, therefore, in the history of the race. The more complete differentiation of the gametes into male and female can be observed among several of the families of the Algae. In some species of Ectocarpus and Gutleria the gametes are much like those of Ulothrix, but some are smaller than the others. The larger ones come to rest soonest, and lose their cilia; one of the smaller more motile ones then fuses with each of the larger. We can in this case speak of the larger as female and' the smaller as male. The differentiation is still very rudi-. 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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