“…The other genera included in the family share the absence of medullary bundles, contrasting with the Cyatheaceae and the studied specimens. Cyatheacean tree ferns are dictyostelic, with numerous, small medullary bundles, and dissected vascular strands in the petiole bases (Lucansky and White, 1974;Lucansky, 1977), contrasting with the solenostelic stem of Yavanna, which presents few bigger medullary bundles, and one or three-parted petiole vascular strands.…”