The population of the Critically Endangered fern Pteris adscensionis is relatively restricted in distribution at present, with plants persisting on the shady cinder banks at the bottom of Breakneck Valley near the Norfolk Island pine plantation, and a larger population on the trachyte cliffs of the north side of Cricket Valley. Spores have been successfully germinated at the Green Mountain nurseries, cared for until maturity and are being reintroduced into their natural habitat.