Epidermal features and petiolar anatomy of a known ethnomedicinal tree fern, Angiopteris evecta, were studied. The stipe receives eleven separate vascular strands from the rhizome which fuse together to form five strands during their upward course.
"Epidermal Features and Petiolar Anatomy of Angiopteris evecta (Forst.) Hoffm. (Marattiaceae: Pteridophyta),"
Ethnobotanical Leaflets: Vol. 2008
, Article 17.
Available at: http://opensiuc.lib.siu.edu/ebl/vol2008/iss1/17