No such thing as a petiolate leaf occurs in acrogens, all are attached by a broad base?
"Journals of Travels in Assam, Burma, Bhootan, Afghanistan and TheNeighbouring Countries" by William Griffith
Thirdly, that of the Ferns, Equisetums and Club-mosses (Acrogens).
"The Chain of Life in Geological Time" by Sir J. William Dawson
SUBCLASS I. VASCULAR ACROGENS, OR PTERIDOPHYTES.
"The Manual of the Botany of the Northern United States" by Asa Gray