. Introduction to botany. Botany. M08SES, LIVERWORTS, AND FERNS 279. Modern equisetums live about open marshes, in sandy wastes, and along railroad embankments. They have hard, rough, siliceous stems, with small leaves that form sheaths about the jomts of the stem (fig. 217). In the most com- mon sjiecies of Eqiiisetmn the sporophyll branch appears very early iir the spring and produces at its tip the strobilus, or cone, which bears the sporangia upon greatly reduced and transformed leaves (sporophylls). Tlie bushy chlorophyll branch appears later and is the one which grows through- out the se
. Introduction to botany. Botany. M08SES, LIVERWORTS, AND FERNS 279. Modern equisetums live about open marshes, in sandy wastes, and along railroad embankments. They have hard, rough, siliceous stems, with small leaves that form sheaths about the jomts of the stem (fig. 217). In the most com- mon sjiecies of Eqiiisetmn the sporophyll branch appears very early iir the spring and produces at its tip the strobilus, or cone, which bears the sporangia upon greatly reduced and transformed leaves (sporophylls). Tlie bushy chlorophyll branch appears later and is the one which grows through- out the season, the sporo- phyll branch disappearing as soon as the spores have been shed. The spores are attached to pecul- iar strap-lilie outgrowths known as elaters (driv- ers). The elaters are supposed to assist in dis- tributing the spores. The bushy foliage, or chlorophyll part of the plant, grows and depos- its food material which may be used the next season for the growth of the sporophyll 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 Bergen, Joseph Y. (Joseph Young), 1851-1917; Caldwell, Otis William, 1869- joint author. Boston, New York, [etc. ] Ginn and company
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