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Adiantum aleuticum (Rupr.) Paris

Western maidenhair fern, five-fingered fern

KingdomPlantaePlants, but not fungi, lichens, or algae
SubkingdomTracheobiontaVascular plants—plants with a “circulatory system” for delivering water and nutrients
DivisionPteridophytaFerns
ClassFilicopsida“Leptosporangiate” (has to do with how their spores form) ferns—includes most ferns
OrderPolypodialesPolypod ferns
FamilyPteridaceaeFerns that grow on rocks (mostly)
GenusAdiantumMaidenhair ferns
SpeciesaleuticumOf or from the area of the Aleutian Islands off the Alaskan coast

About plant names...

These attractive ferns are natives of western North America, with some populations found in parts of northeastern North America as well. They are found on shady, moist stream­banks, ridges or ledges, and on rocky slopes. They have a fondness for serpentinite rock.

Plants: These ferns have a rather delicate appearance. They are 18-30" (46-76 cm) in size. The stem (stipe) is red-brown to black in color.

Leaves: Bipinnate fronds are in a palmate arrangement, like fingers on a hand. Fronds are 8-18" (20-45 cm) long.

Sporangia: There are 4-6 sori per pinnule. They aren’t directly visible, encapsulated in modified leaflets called false indusia.

Online References:

Adiantum aleuticum on gobotany.nativeplanttrust.org

Adiantum aleuticum on calscape.org

Adiantum aleuticum from the Jepson Manual

Adiantum pedatum L. var. aleuticum Rupr.

Adiantum pedatum L. ssp. aleuticum (Rupr.) Calder & Roy L. Taylor

Adiantum pedatum L. ssp. calderi Cody

Adiantum pedatum L. ssp. subpumilum (W.H. Wagner) Lellinger

Adiantum pedatum L. var. subpumilum W.H. Wagner

 

Adiantum aleuticum description by Thomas H. Kent, last updated 29 Aug 2021.

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Adiantum aleuticum (western maidenhair fern, five-fingered fern)

5/22/2010 · Garden in the Woods, Framingham, Mass­a­chu­setts
≈ 17 × 12" (44 × 29 cm)

Adiantum aleuticum (western maidenhair fern, five-fingered fern)

1/19/2021 · Garden in the Woods, Framingham, Mass­a­chu­setts

Adiantum aleuticum (western maidenhair fern, five-fingered fern)

5/22/2010 · Garden in the Woods, Framingham, Mass­a­chu­setts
≈ 24 × 16" (62 × 41 cm)

Range: Zones 3-8:

About this map...