Adianthum aleuticum

Adiantum aleuticum is native mainly to western North America from the Aleutian Islands of Alaska, south to Chihuahua, and also locally in northeastern North America from Newfoundland south to Vermont. 

It prefers fertile, moist soil in rock crevices near streams, from sea level in the north of its range, up to 3,200 m altitude in the south of its range. It tolerates serpentinite rock well, and is confined to this mineral-rich rock in some areas. 

The species and its cultivar 'Subpumilum' have gained the Royal Horticultural Society's Award of Garden Merit. Though hardy they may also be grown as houseplants. They prefer low to medium light, and will grow in moist potting mix. They may prove difficult to keep alive in dry climates. 

Adiantum is derived from Greek and means 'unwetted'. This name is in reference to the fact that its leaves do not become saturated, even when they are submerged in water. In the US, they are suitable for USDA hardiness zones 3-8. 

Aleuticum means 'from the Aleutian Islands'.