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.
Pteridospermae, "In its vegetative characters this plant combines features of Lyginopteris of the Pteridospermae, and Poroxylon which is assigned to the Cordaitales on the basis of its foliage."
typeseries:
Callistophyton poroxyloides
Scratchpads developed and conceived by (alphabetical):
Ed Baker,
Katherine Bouton
Alice Heaton
Dimitris Koureas,
Laurence Livermore,
Dave Roberts,
Simon Rycroft,
Ben Scott,
Vince Smith