Trichomanes lineolatum

Plants on rock. Stems long-creeping, threadlike, bearing scattered leaves, covered with dark hairs of 2 types, 2-celled glandular-hairs and elongate rhizoidlike hairs; roots absent. Leaves round to obovate, simple to irregularly lobed, 1–3 × 0.5–1.5 cm, with dark stellate hairs on margin, 2-celled glandular-hairs on petioles and veins, and dark rhizoidlike hairs on petioles; petioles shorter than blades. Venation repeatedly forking from the base; unconnected false veins few or absent. Soral involucres 1–5 per leaf, terminal on blades, narrowly conic, not flaring at mouth; involucre lips with conspicuous dark marginal band 2–5 cells wide. Gametophytes unknown, presumed to as others of subgenus. 2n = 68.

Habitat: On rock in limestone sinks
Elevation: below 10 m

Fla., Mexico, West Indies, Central America, South America

Discussion

Trichomanes lineolatum leaves have unusually thick veins that are enlarged toward the margin and conspicuous in dried specimens.

Selected References

None.

Lower Taxa