title: Athyrium haleakalae(Athyriaceae), a new rheophytic fern species from East Maui, Hawaiian Islands: with notes on its distribution, ecology, and conservation status.
abstract: Athyrium haleakalaeK.R. Wood & W.L. Wagner (Athyriaceae), a small lithophytic fern from East Maui, Hawaiian Islands, is described and illustrated. Notes on its distribution, ecology, and conservation status are also presented. The new species appears to be an obligate rheophyte, preferring sites of fast moving water along concave walls of streams and waterfalls.Athyrium haleakalaediffers from the only other known HawaiianAthyrium,Athyrium microphyllum(Sm.) Alston, in having rhizomes 1-3 cm long and lanceolate blades 1- to 2-pinnate-pinnatifid, 3-8(-11) × 1-3(-4) cm, as compared toAthyrium microphyllumhaving rhizomes (10-)15-30 cm long and ovate to ovate-triangular blades 3-pinnate-pinnatifid to 4-pinnate, 30-82 × 20-50 cm.
authors.affiliation: National Tropical Botanical Garden, 3530 Papalina Road, Kalāheo, HI 96741, USA.
authors.forename: Kenneth R
authors.initials: KR
authors.lastname: Wood
authors.affiliation: Department of Botany, Smithsonian Institution, PO Box 37012, Washington, DC 20013-7012, USA.
authors.forename: Warren L
authors.initials: WL
authors.lastname: Wagner
keywords: Athyriaceae; Athyrium; Critically Endangered; East Maui endemic; Hawaiian Islands; new species; rheophyte