Sadleria cyatheoides

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Sadleria cyatheoides
Starr 081014-0250 Sadleria cyatheoides.jpg

Vulnerable (NatureServe)
Scientific classification
Kingdom: Plantae
Division: Pteridophyta
Class: Polypodiopsida
Order: Polypodiales
(unranked): Eupolypods II
Family: Blechnaceae
Genus: Sadleria
Species: S. cyatheoides
Binomial name
Sadleria cyatheoides

Sadleria cyatheoides, commonly known as amaumau fern[2] or ʻamaʻu, is a fern species in the family Blechnaceae, in the eupolypods II clade[3] of the order Polypodiales,[4] in the class Polypodiopsida.[5] 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 Crater is named for this species.[6]


The young fronds are often tinged red to block harmful rays from the sun.[7]


  1. ^ "Sadleria cyatheoides". Germplasm Resources Information Network (GRIN). Agricultural Research Service (ARS), United States Department of Agriculture (USDA). Retrieved 2011-06-14. 
  2. ^ "Sadleria cyatheoides". Natural Resources Conservation Service PLANTS Database. USDA. Retrieved 26 October 2015. 
  3. ^ 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): 70. doi:10.1093/sysbio/sys001. PMID 22223449. 
  4. ^ 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. 
  5. ^ 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. 
  6. ^ 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. 
  7. ^ Read on a sign in Hawaii Volcanoes National Park on 31.10.2013

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