. The essentials of botany. Botany. PTEBIDOPHTTA. 209 are all of one kind, and are borne in roundish spore-cases, â which are generally single on each leaf. The Club-mosses are commoa in the Appalachian region, Canada, and northwestward, and all but one of our species belong to the genus Lycopodium. Of these may be mentioned the Common Club- mosses (L. clavatum and L. complanatum) and the Ground-pine (L. dendroideum), all extensively used in Christmas decorations. 438. The Little Club-Mosses {Order Selaginellaceoe) re- semble the foregoing, but are generally smaller and more Moss-like, and hav
. The essentials of botany. Botany. PTEBIDOPHTTA. 209 are all of one kind, and are borne in roundish spore-cases, â which are generally single on each leaf. The Club-mosses are commoa in the Appalachian region, Canada, and northwestward, and all but one of our species belong to the genus Lycopodium. Of these may be mentioned the Common Club- mosses (L. clavatum and L. complanatum) and the Ground-pine (L. dendroideum), all extensively used in Christmas decorations. 438. The Little Club-Mosses {Order Selaginellaceoe) re- semble the foregoing, but are generally smaller and more Moss-like, and have (-with few exceptions) four-ranked leaves. Their spore-cases occur singly on certain more or less modified leaves, which are clustered into terminal spikes. The spores are of two kinds; the small ones, which are very numerous, are generally borne in spore-cases in the upper part of the spike, while the larger ones (macrospores) are mostly four in each spore-case in the lower part of the spike (Fig. 118). FiQ. 119.âPlantlets of a Little . â mi /> , , <⢠1 Club-moss (Selaginella martensii), 439. The Iirst stage OI the showing cotyledons. . lets growing from one spore; p, Little Club-mosses is almost ob- "le first stage (prothalUum). II, a plantlet separated from the spore; literated. "When a small spore Xi^^f.,) -^ * nifled'"⢠" *^* germinates, it becomes divided internally into a considerable number of cells, one of which appears to represent the first stage (prothallium), while all the rest form one large antherid, each cell of which pro- duces an antherozoid. 440. The large spore likewise produces a very small growth, which in this case, however, protrudes a little from the ruptured spore-wall. Upon this several archegones de-. 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
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