Observations on the Aphlebiae and Megasporangia of Stauropteris burntislandica P. Bertrand

The aphlebiae of Stauropteris burntislandica are shown to bemore complex than the simple forked processes indicated by Surange.They are variable structures and consist of a protuberance orridge bearing 5–7 appendages probably arising by dichotomousbranching; the vascular system is also branched and supplieseach large lobe of the aphlebiae with a small strand of tissueof tracheidal character. A megasporangium is described containing more than four megaspores,possibly as many as seven or eight, indicating that two tetradsmay sometimes be involved in megaspore formation.