Sadleria cyatheoides
Sadleria cyatheoides, commonly known as amaumau fern or amau, 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 . Reaching a height of  and a trunk diameter of , amau resembles a small tree fern. Kīlauea's Halemaʻumaʻu is named for this species. Its pith and young fronds are edible either roasted or steamed. Description 
The young fronds are often tinged red to block harmful rays from the sun. References

External links
Sadleria cyatheoides. NatureServe. 2012. Blechnaceae
Endemic flora of Hawaii
Native ferns of Hawaii
Plants described in 1824