Lycopodium nudum L.; Psilotum nudum var. oahuense (F. Muell.) 0. Deg. & I. Deg.; P. oahuensis F. Muell.; P. triquetrum Sw.

Common names: moa, moa nahele (forest moa), pipi, 'o'o moa (P. & E.) ('o'o moa means cock's crow) , upright whiskfem

Indigenous                             

Latin nudus, bare, naked, alluding to the naked nature of the stems.

Plants mostly terrestrial. Stems upright, spreading, 3-angled, triangular in cross section, 10-60 cm long x 0.5-1.5 mm wide near bases, narrowing toward apexes, lower un-branched portions 50-250 percent of length of branched portions, distal branchlets nearly upright, usually not arched. Sporangia 3-ranked on branchlet ridges.

Present on all major islands, also on Ni 'ihau and Kaho'olawe, from near sea level to 1,200 m. This pantropical species is found in many habitats on rocks, lava flows, and commonly epiphytically on tree trunks and in forks of branches. It is weedy in many urban habitats and is found in gardens, flowerpots, and at bases of trees.

Psilotum nudum may be distinguished from P. complanatum by its 3-angled stems, upright habit, and synangia arranged in 3 rows.