. Plant life and plant uses; an elementary textbook, a foundation for the study of agriculture, domestic science or college botany. Botany. CLUB MOSSES 425 sporophylls). Not all of the stem tips are fertile; that is, not all of them bear the little bean-shaped, yellowish sporangia. Some of the club mosses do not have the strobilus so clearly defined as it is in the equisetums, but in others the spo- rangia-bearing tips have their leaves more closely set together than those of the sterile tips, and the strobilus is very distinct. It has a club- shaped appearance; hence the name club mosses. (Se
. Plant life and plant uses; an elementary textbook, a foundation for the study of agriculture, domestic science or college botany. Botany. CLUB MOSSES 425 sporophylls). Not all of the stem tips are fertile; that is, not all of them bear the little bean-shaped, yellowish sporangia. Some of the club mosses do not have the strobilus so clearly defined as it is in the equisetums, but in others the spo- rangia-bearing tips have their leaves more closely set together than those of the sterile tips, and the strobilus is very distinct. It has a club- shaped appearance; hence the name club mosses. (See Figure 218.) Selaginella. — This is the name of a group of club mosses. Some of the Selaginellas are quite common in greenhouses. Their general struc- ture and habit of growth are like that of the club mosses already described, but they are more deli- cate and graceful. They are smaller. Their leaves are both smaller and broader. They are not such hardy plants as the coarser club mosses. (See Figure 2ig.) In tracing the history of plants the Selaginellas are very interesting and important. They have the re-. Fig. 217. — Lycopodium. Ground pine or club moss. This is a picture of one of the simplest species of this genus. In it the sporan- gia are not restricted to certain leaves, but a. spo- rangium is usually found in the axil of each leaf. Near the top may be noted some sporangia which have not yet discharged their spores. markable habit of producing two kinds of spores. Heretofore we have found but one kind of spore. This habit of producing two kinds of spores would be of no great interest to us if it were a habit 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 Coulter, John G. (John Gaylord), b. 1876. New York, American Book Co
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