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

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

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