. Plant studies; an elementary botany. Botany. lis PLANT STUDIES. Fig. 130. A fniit of witch hazel discliai-giiig its seeds.—After Beal. light or sandy soil (see Fig. 120). When the work of the season is over, and the absorbing rootlets have shriveled, the plant is easily blown from its anchorage by a gust of wind, and is trundled along tlie surface like a liglit wicker ball, the ripe seed ves- sels dropping their seeds l)y tlie way. In case of an obstruction, such as a fence, great masses of these tumble- weeds may often be seen lodged against tlie windward side. 79. Discharge of spores.—In m
. Plant studies; an elementary botany. Botany. lis PLANT STUDIES. Fig. 130. A fniit of witch hazel discliai-giiig its seeds.—After Beal. light or sandy soil (see Fig. 120). When the work of the season is over, and the absorbing rootlets have shriveled, the plant is easily blown from its anchorage by a gust of wind, and is trundled along tlie surface like a liglit wicker ball, the ripe seed ves- sels dropping their seeds l)y tlie way. In case of an obstruction, such as a fence, great masses of these tumble- weeds may often be seen lodged against tlie windward side. 79. Discharge of spores.—In many plants the distribution of spores and seeds is not provided for Ijy any of the metliods just mentioned, but the vessels containing them are so constructed that they are discliarged with more or less violence and are some- wliat scattered. Many spore cases, especially those of the lower plants, burst irregularly, and witli suthcient violence to throw out spores. In the liverworts pecu- liar cells, called elaters or "jumpers," are formed among the spores, and when tlie w;dl cf the spore case is ruptui'ed the elaters are liberated, and by their iictive motion assist in discharging the spores. In most of the true mosses the sjiore case opens by pushing off a lid at the apex, which exposes a delicate fringe of teeth covering the mouth of the urn-like case. These teeth bend in and out of the open spore case as they become moist or. 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 and Company
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