Hymenophyllum dilatatum (Matua mauku)(
Order : Hymenophyllales
Species: H. dilatatum
Binomial name: Hymenophyllum dilatatum
Synonyms: Mecodium dilatatum, Sphaerocionium dilatatum, Trichomanes dilatatum, Diplooephyllum dilatatum, Leptocionium sororium.
Common names:Filmy fern, Matua mauku
Hymenophyllum dilatatum is an epiphytic (very rarely terrestrial) fern and is a member of the Filmy ferns (genus Hymenophyllum). It is endemic to New Zealand and found through out New Zealand including Stewart, Chatham and the Auckland Islands. It is uncommon in the drier parts of the eastern South Island. It grows in coastal to montane forests epiphytically on trees or on fallen trees and sometimes on banks. It grows very rarely terrestrially on the forest floor.
It is the largest of New Zealand filmy ferns.