Aleutian maidenhair
Adiantum aleuticum (Rupr.) Paris
Aleutian maidenhair spreads finely divided fronds into a fan. Formerly included in eastern maidenhair, Adiantum pedatum, it is recognized separately. The two are reproductively isolated, although their morphological differences can be subtle. Flora of North America: Adiantum aleuticum
Botanical name
Flora of North America accepts Adiantum aleuticum as a separate species. Flora of North America: Adiantum aleuticum
Recognizing the plant
Its frond branches into a spreading, sometimes funnel-shaped blade, with small, sharply toothed segments arranged along fine axes. Fronds may arch loosely, stand upright or hang from their growing place, and can measure 15–110 centimetres long. Modified leaf margins form protective covers over the spore-bearing structures. Flora of North America: Adiantum aleuticum
Spores and seasonal development
North America
This fern reproduces by spores. Flora of North America records its spore-producing season as summer through autumn. Flora of North America: Adiantum aleuticum
Native range
Adiantum aleuticum occurs in wooded ravines, on shaded banks and talus slopes, and on exposed serpentine ground. Flora of North America records it from Alaska and western Canada south through the western United States to Chihuahua, Mexico. Separated eastern populations occur on serpentine in Newfoundland, Quebec, Maine, Maryland, Pennsylvania and Vermont. Other disjunct populations occupy wet rock fissures at high elevations. Flora of North America: Adiantum aleuticum
Botanical sources
Reviewed 2026-10-11. Seasonal development varies with location and growing conditions.