Flora of the Hawaiian Islands
Pteridophyte Literature for Adiantum hispidulum
Palmer, 2003.
   Pteridaceae Bibliography
      Adiantum hispidulum

Common name(s): `iwa`iwa, maidenhair ferns, rough maidenhair fern
General Information
DistributionNative to Asia (India to Africa), Australia, and Pacific islands.In the Hawaiian Islands, naturalized on Kaua`i, O`ahu, Moloka`i, Lana`i, Maui, Kaho`olawe, Hawai`i.

HabitatDry to wet forests in many mesic, open-canopy forest locations
Elevation90-1250 m
Terrestrial, stiff, erect; rhizomes erect to decumbent.
Fronds clustered at apex of rhizome, 6-40(-52) cm long, young fronds rosy pink; stipe dark brown, rough, clothed with short dark fibrils and hairs; blade 2- to 8-pinnate, deltate to ovate, dichotomously branched at 45° angle, each branch in turn repeatedly forking again; rachises hairy and fibrillose; ultimate segments nearly sessile or with asymmetrically attached short stalks, often overlapping, dimidiate, segments oblong-rectangular to diamond-shaped, firm, lower margin entire, upper margin dentate when sterile, both surfaces with fine, short, light hairs; veins mostly ending in marginal teeth.
Sori 6-14 per segment, U-shaped in marginal sinuses; indusial flap with brown hairs.
Latin hispidus, hairy, + ulus, a diminutive suffix, alluding to the fine hairiness of the fern.
Sally Eichhorn