Callistophyton
genus
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genus
Characteristics of species those of genus. Primary xylem development mesarch. Cortical appendages having constricted base and inflated tip, apparently glandular. Secondary tracheids with up to 7 rows of borderred pits on radial walls.
Plants with slender stems, producing pinnately compound fronds and axillary buds or branches at each node. Adventitious roots present at some nodes. Stems up to 3 cm in diameter, constructed of central pitch surrounded by primary xylem bundles. Bundles number 9-13 in section view, consist of 5 axial bundles and leaf traces. Leaf traces double stranded at leaf base. Cortex composed of thick parenchymatous inner zone, and outer zone with hypodermal fibers. Secondary tissues well developed in older stems; absent from stem, branch and bud apices.
Stem axes up to 2.2 ern. in diameter possessing a solid parenchymatous pith; spherical secretory cavities lined with epithelium scattered within the pith, amber-colored resin-like remains occasionally preserved within the cavities.