Kauai, Oahu, Molokai, Maui and Hawaii, Hawaiian Islands, USA
Vanishing Flora thread
Daniel D. Palmer: Hawaii's Ferns and Fern Allies
Wood, Kenneth R., Oppenheimer, Hank and Keir, Matthew. (2019). A checklist of endemic Hawaiian vascular plant taxa that are considered possibly extinct in the wild. National Tropical Botanical Garden, Technical Report #314.