. A text-book of botany for secondary schools. Botany. MOSSES 179 It must be remembered, however, that the sperms are very small and can swim in such a film of water as may be left on the plant by a heavy dew or rain. Since many mosses grow in very dry places, fertilization with them must be very in- frequent. When the sperms are free to swim they are attracted toward the necks of the arche- gonia, pass down them, reach the egg, and fertili- zation is accomplished. The oospore thus formed within the archegonium at once begins to germinate (Fig. 172), and forms the spore- producing structure, w
. A text-book of botany for secondary schools. Botany. MOSSES 179 It must be remembered, however, that the sperms are very small and can swim in such a film of water as may be left on the plant by a heavy dew or rain. Since many mosses grow in very dry places, fertilization with them must be very in- frequent. When the sperms are free to swim they are attracted toward the necks of the arche- gonia, pass down them, reach the egg, and fertili- zation is accomplished. The oospore thus formed within the archegonium at once begins to germinate (Fig. 172), and forms the spore- producing structure, which in mosses is much more than a "^S^i^.. Fig. 174.—Spore-cases of a , from which the lids have fallen, displaying the teeth. —After Kerner,. 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 Coulter, John Merle, 1851-1928. New York, D. Appleton
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