. Plant life and plant uses; an elementary textbook, a foundation for the study of agriculture, domestic science or college botany. Botany. MOSSES 407 in proportion to the sterile part than is the case in the sporogonium of Marchantia. By sterile part is meant any part which does not produce spores. This increase in the sterile part of the sporophyte is significant, for in higher plants we find that nearly all the cells of the sporophyte are sterile. The sporogo- nium of certain mosses, like that of Anthoceros among liverworts, contains chloro- phyll and does some food making. The bulk of its
. Plant life and plant uses; an elementary textbook, a foundation for the study of agriculture, domestic science or college botany. Botany. MOSSES 407 in proportion to the sterile part than is the case in the sporogonium of Marchantia. By sterile part is meant any part which does not produce spores. This increase in the sterile part of the sporophyte is significant, for in higher plants we find that nearly all the cells of the sporophyte are sterile. The sporogo- nium of certain mosses, like that of Anthoceros among liverworts, contains chloro- phyll and does some food making. The bulk of its nourishment, however, is probably absorbed by the foot from the tissues of the leafy stem. As in liverworts, the sporophyte is a parasite upon the gametophyte. The gametophyte in mosses in- cludes both the protonema and the leafy Fig. 203. — A young moss plant arising from the protonema and putting out rhizoids. Note the diagonal cross walls of the filaments. At the end of one of these filaments a resting bud appears. A moss plant may arise from this. B. Increase of the Sporo- phyte. — Already we have noted that the sporophyte becomes more prominent as we go from the simpler plants to the more complex ones. At first the sporophyte is only a number of spores and a case. Gradually it increases in size and becomes differentiated into several kinds of tissues and organs. It begins to do leaf work. We have seen this in both liverworts and mosses. (See Figure 206.). 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 G. (John Gaylord), b. 1876. New York, American Book Co
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