|Pteridophyte|| Literature for Psilotum nudum
Flora of Australia vol. 48. 1998; Lorence & Wagner, 2019.
Common name(s): `o`o moa, moa, moa nahele, pipi, upright whiskfern
|Distribution||Widespread in the tropics and subtropics.In the Hawaiian Islands, indigenous to Midway, Ni`ihau, Kaua`i, O`ahu, Moloka`i, Lana`i, Maui, Kaho`olawe, Hawai`i.|
|Habitat||Rocks, lava flows, and many urban habitats|
||Epiphytic, epipetric, or occasionally terrestrial. Rhizomes intricately branching, creeping, but often clumped or knotted, covered with short brown rhizoidal hairs.
||Aerial shoots erect, firm or sometimes flaccid in shaded situations, branched to 4-5 times in different planes in the distal parts, 10-85 cm long; branches green, prominently 3-7-ribbed, subterete in cross-section, to 4.5 mm in diameter, stomata restricted to furrows between ribs; sterile leaves restricted to ribs, subspiral, 1-2.5 mm long, terete, pale yellow, translucent towards the tips.
||Synangia 1.5-2 mm long, 2-2.5 mm wide, (2)3-lobed.
||2n = 104 (NZ), 156, 208 (India).
||Latine nudus, bare, naked, alluding to the naked nature of the stems.
||David Lorence, co-author K. R. Wood