. The anatomy of woody plants. Botany -- Anatomy. GNETALES 359 incorporated in the large ray, for fibers are also present, although they cannot be so well recognized in the transverse section. The constitution and origin of the large rays in Ephedra are of great signifi- cance, not only for the Gnetales them- selves, but also in connection with the problem of the evo- lution of the higher forms known as dicotyledonous an- giosperms. It will accordingly be con- sidered somewhat in detail. Fig. 257 illus-. trates the organiza- FIG. 256.—Transverse section of the wood of Ephedra species. tion of
. The anatomy of woody plants. Botany -- Anatomy. GNETALES 359 incorporated in the large ray, for fibers are also present, although they cannot be so well recognized in the transverse section. The constitution and origin of the large rays in Ephedra are of great signifi- cance, not only for the Gnetales them- selves, but also in connection with the problem of the evo- lution of the higher forms known as dicotyledonous an- giosperms. It will accordingly be con- sidered somewhat in detail. Fig. 257 illus-. trates the organiza- FIG. 256.—Transverse section of the wood of Ephedra species. tion of the large ray in an early stage of development when it is still rather nar- row and close to the medullary region of the stem. An in- spection of the illus- tration makes it clear that the ray is by no means a homogeneous struc- ture composed entirely of storage parenchyma. Fi- brous elements necessarily enter. 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 Jeffrey, Edward C. (Edward Charles), b. 1866. Chicago, Ill. , The University of Chicago Press
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