5: 413. 1793.
Stems densely scaly. Leaves pendent, linear. Veins anastamosing in single row of areolae on each side of midrib. Sori in single submarginal groove on each side of midrib. Gametophytes 0.5–2 × 0.5–1 cm; gemmae uniseriate, 2–5 mm, borne at apices of aerial branches; body cells 2–16; rhizoid primordia cells 0–4.
Worldwide in tropics and subtropics.
Species ca. 50 (3 in the flora).
|1||Stem scales tapering to long filiform tips; soral paraphyses without dilated terminal cells; spores monolete.||Vittaria lineata|
|1||Gemmae variable in length; body cells 2-16, rhizoid primordia present or absent.||> 2|
|2||Gemmae with 4-16 body cells, end cells equal to or smaller than medial cells; rhizoid primordia on some medial cells and regularly on end cells; sporophytes frequently produced.||Vittaria lineata|
|2||Gemmae with 2-12 body cells but at least some 2-3-celled gemmae present, end cells often swollen and larger than medial cells; rhizoid primordia often absent on 1 or both end cells, seldom present on medial cells; sporophytes not produced.||Vittaria appalachiana|