Abstract
New studies on the anatomy of the leaf, stem, stolon and root of 17 taxa of Gunnera have revealed several interesting anatomical features. Scalariform perforation plates occur in most vessel elements of stolons and roots, although simple perforation plates are more frequent in the stems of large leafed-species. The leaf surface and internal anatomy have not been studied since the late 19th and early 20th centuries. In this paper, detailed studies of the leaf include features such as marginal and laminar hydathodes, «warts», hair types, and groups of 2–5 palisade-like cells connected to each other by short communicating tubes. The anatomy of Gunnera herteri is described in detail for the first time. Nostoc colonies in the leaf are illustrated.
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