. Botany for high schools. Botany. MOSSES plant begins with the spore and ends with the unfertilized egg in the egg case. The spore plant begins with the fertilized egg and ends with the mother cell (of the spores) in the capsule. bporopnyte. Diagram No. IV. Illustrating the life cycle of the Bryophytes (a liverwort or moss). Course of development follows the direction indicated by arrows. The zygote is the fertil- ized egg. Vegetative multiplication by buds and filamentous outgrowths of the thallus. Note increase of sporophyte. 493. Comparative review of the mosses.—The first genera- tion (or
. Botany for high schools. Botany. MOSSES plant begins with the spore and ends with the unfertilized egg in the egg case. The spore plant begins with the fertilized egg and ends with the mother cell (of the spores) in the capsule. bporopnyte. Diagram No. IV. Illustrating the life cycle of the Bryophytes (a liverwort or moss). Course of development follows the direction indicated by arrows. The zygote is the fertil- ized egg. Vegetative multiplication by buds and filamentous outgrowths of the thallus. Note increase of sporophyte. 493. Comparative review of the mosses.—The first genera- tion (or gametophyte) of the mosses begins with the spore which produces the protonema, either a branched filamentous green growth, or a thallose one as in the peat mosses. This suggests that the ancestors of the mosses were plants resembling the algae or liverworts, though no alga or liverwort is now known which could be regarded as an ancestor of the mosses. From the protonema the leafy-stemmed moss plant is developed as a branch. This bears the sexual organs. The second generation i(or sporophyte) is developed from the fertilized egg. It remains dependent on the leafy stemmed plant for its food, the stalk being wedged into the tissues of the stem. The capsule of the mosses lis a much more highly developed and complex structure than that of the liverworts, and shows that the mosses stand higher in the scale of classification and development than the liverworts. 494. Relationship of the liverworts and mosses.—^There are, however, taken as a whole, very close relationships between the liverworts and mosses, showm in .the character of the sexual organs, and especially in the capsule, though there are great. 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 Atkinson, George Francis, 1854-1918. New York, H. Holt and
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1910
