. Botany, with agricultural applications. Botany. 428 PTERIDOPHYTES (FERN PLANTS) the structures characteristic of the stems of Seed Plants and are, therefore, not merely stems in appearance as the stem-like struc- tures developed by the gametophytes of Mosses and some Liver- worts are. It remained for the sporophyte generation to develop. Fig. 379. — A Tree Fern. After Bailey. a real stem. At the tip of the Fern sporophyte there is a meriste- matic region which by the rapid growth and division of its cells elongates the stem. Just behind the advancing tip new roots and leaves are developed an
. Botany, with agricultural applications. Botany. 428 PTERIDOPHYTES (FERN PLANTS) the structures characteristic of the stems of Seed Plants and are, therefore, not merely stems in appearance as the stem-like struc- tures developed by the gametophytes of Mosses and some Liver- worts are. It remained for the sporophyte generation to develop. Fig. 379. — A Tree Fern. After Bailey. a real stem. At the tip of the Fern sporophyte there is a meriste- matic region which by the rapid growth and division of its cells elongates the stem. Just behind the advancing tip new roots and leaves are developed and stem tissues are formed. A cross section of a stem, as shown in Figure 380, shows an epidermis, cortex, vascular cylinder, and pith — tissues characteristic of the stems of Seed Plants. The roots too are true roots and are not simple structures like the rhizoids of gametophytes. They have a root cap, region of growth and elongation, epidermis, root hairs, cortex, and vascu- lar cylinder, thus having the features characteristic of the roots of Seed Plants. The leaves, although true leaves, are generally called fronds, a, term formerly applied to them because they were considered a combination of leaf and stem. Fern leaves are usually much branched and are easily identified by the way their veins branch and by the way they develop in the spring. Their veins branch by forking; that is, a vein divides into two veins of equal size. 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 Martin, John N. (John Nathan), b. 1875. New York, John Wiley & sons, inc. ; [etc. ,etc. ]
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectbotany, bookyear1920
