Flora of the Hawaiian Islands
Pteridophyte Literature for Pityrogramma calomelanos
Flora of Australia, vol. 48. 1998 Tryon et al. 1975; Lorence & Wagner 2019..
   Pteridaceae Bibliography
      Pityrogramma calomelanos

Common name(s): silver fern, silverback fern
General Information
DistributionNative to the Americas from the Caribbean region south to Argentina; now naturalized in many tropical parts of the world.In the Hawaiian Islands, naturalized on Ni`ihau, Kaua`i, O`ahu, Moloka`i, Lana`i, Maui, Kaho`olawe, Hawai`i.

Elevation0-1000 m
Terrestrial. Rhizomes erect, scaly at apex; scales light brown, lanceolate, to 5 mm long, 0.5 mm wide, margin entire.
Fronds densely clustered, erect-spreading, to 95 cm long; stipe 15-50 cm long, grooved and ridged adaxially; blade usually shorter than the stipe, narrowly ovate to lanceolate, 15-45 cm long, 6-27 cm wide, mostly 2-pinnate-pinnatifid to 3-pinnate, lowermost pinnae the largest, dark green, glossy above, below with a white waxy, powdery indumentum, rarely glabrous, subcoriaceous to chartaceous, pinnae stalked.
Sporangia dark, scattered along veins of the fertile segments, when mature seen as dark lines through the white indumentum.
David Lorence, co-author K. R. Wood