Do both Coprosma and Dicksonia belong to a genus of tree ferns in the order of Cyatheales?
Dicksonia Dicksonia is a genus of tree ferns in the order Cyatheales. It is regarded as related to "Cyathea", but is considered more primitive, dating back at least to the Jurassic and Cretaceous periods. The fossil record includes stems, pinnules, and spores.
Sadleria cyatheoides Sadleria cyatheoides, commonly known as amaumau fern or ʻ amaʻ u, is a fern species in the family Blechnaceae, in the eupolypods II clade of the order Polypodiales, in the class Polypodiopsida. It is endemic to Hawaii and inhabits lava flows, open areas, and wet forests on all major islands up to an altitude of 1676 m . Reaching a height of 0.9 - and a trunk diameter of 7.5 - , ʻ amaʻ u resembles a small tree fern. Kīlauea's Halemaʻ umaʻ u Crater is named for this species.