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Starr 011114-0067 Sadleria cyatheoides.jpg
Sadleria cyatheoides
Scientific classification e
Kingdom: Plantae
Clade: Tracheophytes
Class: Polypodiopsida
Order: Polypodiales
Suborder: Aspleniineae
Family: Blechnaceae
Subfamily: Blechnoideae
Genus: Sadleria

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Sadleria is a genus of six species of ferns in the family Blechnaceae, all endemic to Hawaii.


Georg Friedrich Kaulfuss distinguished the genus in 1824 based on samples of S. cyatheoides acquired by Adelbert von Chamisso in 1821. Chamisso had been serving as the naturalist for a Russian scientific expedition led by Otto von Kotzebue aboard the vessel Rurick. Kaulfuss named the genus after Joseph Sadler (1791–1849), a Hungarian naturalist studied European ferns.


As of December 2019, the Checklist of Ferns and Lycophytes of the World accepted the following species:

  • Sadleria cyatheoides Kaulf. (amaumau fern or rasp fern)
  • Sadleria pallida Hook. & Arn.
  • Sadleria souleyetiana (Gaudich.) Moore
  • Sadleria squarrosa (Gaudich.) T.Moore
  • Sadleria unisora (Baker) Rob.
  • Sadleria wagneriana D.D.Palmer & Flynn

The Halemaʻumaʻu crater on Kīlauea is named after S. cyatheoides.

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