Note 18 — DIVISION III. PTERIDOPHYTA (VASCULAR CRYPTOGAMS).
Michael Cresse Potter translation
In the Polypodiaceæ unisexual prothallia as distinct as those of Equisetum are of common occurrence.
Michael Cresse Potter translation
In the Polypodiaceæ unisexual prothallia as distinct as those of Equisetum are of common occurrence.