. The anatomy of woody plants. Botany -- Anatomy. the larger stems, but these in no case are related to outgoing foliar traces. The general topography of a stem of the type found in the Psilotaceae is presented in Fig. 180. In the Lycopodiaceae in general the leaf traces are ordinarily mesarch in their organization, a condition more or less characteristic of the Lycopsida as a whole. An endodermis can usually be distinguished about the foliar strands, although this limiting layer is ordinarily con- spicuous by its absence FIG. iSo.—Transverse section of the stem of in the Stem in most spe- Psi
. The anatomy of woody plants. Botany -- Anatomy. the larger stems, but these in no case are related to outgoing foliar traces. The general topography of a stem of the type found in the Psilotaceae is presented in Fig. 180. In the Lycopodiaceae in general the leaf traces are ordinarily mesarch in their organization, a condition more or less characteristic of the Lycopsida as a whole. An endodermis can usually be distinguished about the foliar strands, although this limiting layer is ordinarily con- spicuous by its absence FIG. iSo.—Transverse section of the stem of in the Stem in most spe- Psilotum. cies of Lycopodium. In other representatives of the two families under discus- sion an external endoder- mis is usually found in the stem, and, as has been shown above, an internal endodermal zone is seen in the tuberous subterranean stem of Phylloglossum. In the genus Selaginella the fibrovascular tissues of the axis are distinguished by considerable variety in topography. In some spe- cies the stele is a single mass, separated from the. FIG. 181.—Transverse section of stem of Selaginella laevigata, showing a siphonostelic central cylinder. cortical tissues by an air-containing region representing the endo- dermis. In other species the fibrovascular system becomes divided, and the protostelic condition as a result passes into that known as. 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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