Adiantum pedatum maidenhair fern Pteridaceae ADPE; R, gb;

  

adiantum-pedatum-en-wikipedia-org

Adiantum pedantum.en.wikipedia.org (Accessed 9/2016).

Adiantum pedatum is a fern from a creeping rhizome to 0.5 cm thick. 

Leaves (fronds) arising individually or few together along rhizome, twice pinnate; stalk 10-60 cm long, wiry, shiny, purple-black; blade set at right angles to stalk, 10-40 cm long and wide, horseshoe- to nearly ring-shaped with a forked, semi-circular branching pattern, primary leaflets (pinnae) 2-6, 12-22 cm long, 5-9 cm wide, all arising on one side of the rachis (axis) each pinna with numerous, fan-shaped, secondary leaflets (pinnules) in a pinnate arrangement (Radford et al. 1968), midrib close to inner edge. 

Spore cases 0.2-0.5 cm long, 0.1 cm wide, along the lobed outer edges of the pinnules. 

Adiantum pedatum.David G. smith.www.delawarewildflowers.org

Adiantum pedatum.David G. smith.www. delawarewildflowers.org (Accessed 12/2014)

Wetland status: FAC-. 

Frequency in NYC: Very infrequent. 

Origin: Native. 

Habitat: Understory of undisturbed moist woods, high nutrient, humus-rich, soil, pH 4.6-6.6, tolerant of shade, somewhat tolerant of fire, intolerant of drought, salt (USDA, NRCS 2006). 

Notes: Spreads very slowly. New fronds occasionally eaten by rabbits (Gargiullo, personal observation). Listed as exploitably vulnerable in New York State (USDA, NRCS 2017).