Sadleria cyatheoides

Sadleria cyatheoides, commonly known as amaumau fern[3] or ʻamaʻu, is a fern species in the family Blechnaceae, in the eupolypods II clade[4] of the order Polypodiales,[5] in the class Polypodiopsida.[6] It is endemic to Hawaii and inhabits lava flows, open areas, and wet forests on all major islands up to an altitude of 1,676 m (5,499 ft). Reaching a height of 0.9–1.5 m (3.0–4.9 ft) and a trunk diameter of 7.5–10 cm (3.0–3.9 in), ʻamaʻu resembles a small tree fern. Kīlauea's Halemaʻumaʻu is named for this species.[7]

Sadleria cyatheoides
Starr 081014-0250 Sadleria cyatheoides.jpg

Vulnerable (NatureServe)
Scientific classification edit
Kingdom: Plantae
Clade: Tracheophytes
Division: Polypodiophyta
Class: Polypodiopsida
Order: Polypodiales
Suborder: Aspleniineae
Family: Blechnaceae
Genus: Sadleria
S. cyatheoides
Binomial name
Sadleria cyatheoides
  • Blechnum fontanesianum Gaudich.
  • Blechnum kaulfussianum Gaudich.
  • Blechnum cyatheoides (Kaulf.) Christenh.
  • Woodwardia cyatheoides (Kaulf.) Mett.


The young fronds are often tinged red to block harmful rays from the sun.[8]


  1. ^ "Sadleria cyatheoides". Germplasm Resources Information Network (GRIN). Agricultural Research Service (ARS), United States Department of Agriculture (USDA). Retrieved 2011-06-14.
  2. ^ Hassler, Michael & Schmitt, Bernd (November 2019). "Sadleria cyatheoides". Checklist of Ferns and Lycophytes of the World. 8.11. Retrieved 2019-12-24.
  3. ^ USDA, NRCS (n.d.). "Sadleria cyatheoides". The PLANTS Database ( Greensboro, North Carolina: National Plant Data Team. Retrieved 26 October 2015.
  4. ^ Carl J. Rothfels; Anders Larsson; Li-Yaung Kuo; Petra Korall; Wen- Liang Chiou; Kathleen M. Pryer (2012). "Overcoming Deep Roots, Fast Rates, and Short Internodes to Resolve the Ancient Rapid Radiation of Eupolypod II Ferns". Systematic Biology. 61 (1): 490–509. doi:10.1093/sysbio/sys001. PMID 22223449.
  5. ^ Maarten J. M. Christenhusz; Xian-Chun Zhang & Harald Schneider (2011). "A linear sequence of extant families and genera of lycophytes and ferns" (PDF). Phytotaxa. 19: 7–54. doi:10.11646/phytotaxa.19.1.2.
  6. ^ Alan R. Smith; Kathleen M. Pryer; Eric Schuettpelz; Petra Korall; Harald Schneider & Paul G. Wolf (2006). "A classification for extant ferns" (PDF). Taxon. 55 (3): 705–731. doi:10.2307/25065646. JSTOR 25065646.
  7. ^ Little Jr., Elbert L.; Roger G. Skolmen (1989). "ʻAmaʻu, sadleria" (PDF). Common Forest Trees of Hawaii (Native and Introduced). United States Forest Service. Retrieved 2011-06-14.
  8. ^ Read on a sign in Hawaii Volcanoes National Park on 31.10.2013

External linksEdit