. Botany for high schools. Botany. MOSSES 321 high up on the stem. Numerous leafy stems arise from the protonema, thus making dense tufts. The protonema usually disappears soon after the moss stems arise.* Certain species of the mosses often multiply by branching, by the growth of new. Fig. 300. Funaria hygrometrica. A, germinating spore; 7/, vacuole; tv, rhizoid; s, exosporium. portion of a developed protonema, about three weeks after germination; /z, a prostrate primary shoot with brown wall and obliquely transverse septa, from which proceed the ascending branches with limited growth; at K t
. Botany for high schools. Botany. MOSSES 321 high up on the stem. Numerous leafy stems arise from the protonema, thus making dense tufts. The protonema usually disappears soon after the moss stems arise.* Certain species of the mosses often multiply by branching, by the growth of new. Fig. 300. Funaria hygrometrica. A, germinating spore; 7/, vacuole; tv, rhizoid; s, exosporium. portion of a developed protonema, about three weeks after germination; /z, a prostrate primary shoot with brown wall and obliquely transverse septa, from which proceed the ascending branches with limited growth; at K the rudiment of a leafy axis with rhizoid w. (After Sachs.) protonemes from the moss plant, and sometimes by bulbils f or by brood buds. Aitcr the development of the sexual organs, fertilization is brought about by the sperm passing down the canal of the egg case, and fusing with the nucleus of the egg. The fertilized egg then divides and elongates downward to form a foot, which wedges its way into the upper end of the moss stem, while the upper part elongates upward to form the stalk and capsule. At the same time the egg case enlarges to form a pro- * In one genus, Pogonatuyn, the protonema exists for a long time, even until the fruit of the moss appears. Here the protonema is more con- spicuous than the moss plant and covers extensive patches oiHhe ground along the roadside in woods. The protonema in a few of the liigher mosses is partly thallose, as in Tetraphis. t In the mosses these bulbils " are small, rounded masses of 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 Company
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1910
