diameter of 2.5 cm (0.98 in). The largest species of fern is probably Cyathea brownii of Norfolk Island, which may be 20 m (66 ft) or more in height...

Politique et Naturelle de L'Ile de Cuba (Editor: Ramón de la Sagra). Botanique. Plantes Vasculaires. (Physical, Political and Natural History of the...

tubers in adaptation to arid conditions. In contrast, endemic tree ferns (Cyathea) all evolved under very similar conditions in Madagascan humid forests...