Acrostichum aureum L. is the only alien fern that was once established in Hawai'i but is no longer found in the wild. Wagner reported on plants that were introduced in 1926 from the Philippines which were growing at Kamehameha School Farm, Haha'ione Valley, Maunalua (now Hawai'i Kai), O'ahu, during 1933-1938. Field notes by Thomas R.L. McGuire, Board of Agriculture of the Division of Forestry, made available to me by Derral R. Herbst and dated 18 July 1927 record in the marsh back of Kuapa fishpond: "Two ferns, Acrostichum aureum, planted same date [7 August 1926] are growing very slowly." This population persisted and spread slowly in the area but the last remaining plants were destroyed in the 1980s during landscaping of the community club of Hawai'i Kai (Herbst pers. comm.). No other populations of this species have been reported out of cultivation.

Platycerium superbum de Joncheere & Hennipman appears to be in the early stages of becoming established in the Nu'uanu Valley, O'ahu and merits watching.