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 (Rupr.) Paris
Western maidenhair fern, five-fingered fern, Aleutian maidenhair
These attractive ferns are natives of western North America, with some populations found in parts of northeastern North America as well.
Plants: These ferns have a rather delicate appearance. They are 1½–2½′ (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.
Habitats: Shady, moist streambanks, ridges or ledges, and on rocky slopes. They have a fondness for serpentinite rock.
Online References:
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 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
5/22/2010 · Garden in the Woods, Framingham, Massachusetts · ≈ 16 × 11″ (40 × 27 cm) 
5/22/2010 · Garden in the Woods, Framingham, Massachusetts · ≈ 2 × 1′ (62 × 41 cm) 
5/22/2010 · Garden in the Woods, Framingham, Massachusetts · ≈ 2 × 1′ (62 × 41 cm) 
| Kingdom | Plantae | Plants, but not fungi, lichens, or algae (from Stearn's Botanical Latin) |
| Subkingdom | Tracheobionta | Vascular plants—plants with a “circulatory system” for delivering water and nutrients |
| Division | Pteridophyta | Ferns |
| Class | Filicopsida | “Leptosporangiate” (has to do with how their spores form) ferns—includes most ferns |
| Order | Polypodiales | Polypod ferns |
| Family | Pteridaceae | Ferns that grow on rocks (mostly) |
| Genus | Adiantum | Maidenhair ferns |
| Species | aleuticum | Of or from the area of the Aleutian Islands off the Alaskan coast |
Adiantum aleuticum description by Thomas H. Kent, not updated.
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