|Pteridophyte|| Literature for Pityrogramma calomelanos
Flora of Australia, vol. 48. 1998 Tryon et al. 1975; Lorence & Wagner 2019..
Common name(s): silver fern, silverback fern
|Distribution||Native 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.|
||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