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FNA | Family List | FNA Vol. 2 | Hymenophyllaceae | Trichomanes

6. Trichomanes lineolatum (Bosch) Hooker in Hooker & Baker, Syn. Fil. 73. 1867.

Lined bristle fern

Didymoglossum lineolatum Bosch, Ned. Kruidk. Arch. 5: 136. 1863

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 be as others of subgenus. 2 n = 68.

On rock in limestone sinks; below 10 m; Fla.; Mexico; West Indies; Central America; South America.

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


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