1) Family cyatheaceae 2) Fern family 3) Tropical tree ferns 
The Cyatheaceae are the scaly tree fern family and include the world`s tallest tree ferns, which reach heights up to 20 m. They are also very ancient plants, appearing in the fossil record in the late Jurassic, though the modern genera likely appeared in the Cenozoic. Cyatheaceae are the largest family of tree ferns, including about 500 species. ....
(from the article `fern`) ...and more distantly to Dicksonia in the family Cyatheaceae; 1 genus and species, Metaxya rostrata, of low elevations in tropical America.Family ...
[n] - tropical tree ferns
family Cyatheaceae noun tropical tree ferns