. Botany for agricultural students . Botany. 420 BRYOPHYTES (MOSS PLANTS) plants of some Mosses can be identified by a small terminal cup in which the antheridia are produced. The antheridia produce numerous swimming sperms, and, when there is suitable moisture, the sperms reach the archegonia, swim down the long necks into the venters, and fertilize the eggs. The fertilized egg begins to grow almost immediately after fer- tilization, and like the fertilized egg of the Liverworts, it develops in the place in which it was formed. By rapid growth and cell division, it soon forms a spindle-shaped
. Botany for agricultural students . Botany. 420 BRYOPHYTES (MOSS PLANTS) plants of some Mosses can be identified by a small terminal cup in which the antheridia are produced. The antheridia produce numerous swimming sperms, and, when there is suitable moisture, the sperms reach the archegonia, swim down the long necks into the venters, and fertilize the eggs. The fertilized egg begins to grow almost immediately after fer- tilization, and like the fertilized egg of the Liverworts, it develops in the place in which it was formed. By rapid growth and cell division, it soon forms a spindle-shaped body with one end called foot pushing into the stem of the gametophyte to absorb Fig. 375. — A protonema of Moss (X 50). Buds which develop leafy gametophores are shown at b. and the other end pushing into the air, forming a stalk called seta which bears a sporangium at its upper end in which the spores are produced. As the sporophyte develops, the venter about the young sporophyte and also the neck of the archegonium enlarge. Finally the venter is ruptured and the enlarged archegonium is carried up by the sporophyte, forming a pointed cap on the top of the sporangium. When the spores are shed and fall on a moist soil, they produce new However, the spore does not grow a leafy plant directly, but first produces an Alga-like filament which branches and creeps over the substratum (Fig. 375). From bud-like structures on this fila- ment, the leafy green plants grow, thus completing the life. 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 Martin, John N. (John Nathan), b. 1875. New York : John Wiley & Sons, Inc.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1919
