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A. Capíllus-Véneris, L. Fronds with a continuous main rhachis, ovate-lanceolate, 9–18´ long, often pendent, 2–3-pinnate at the base, the upper third or half simply pinnate; pinnules wedge-obovate or rhomboid, 6–12´´ long, deeply and irregularly incised; veinlets flabellately forking from the base; involucres lunulate or transversely oblong.—Moist rocky places, Va. to Mo., and southward.

Stems 1–2´ long, procumbent, sparsely branching; leaves pale green, ovate-triangular, acutely 2-toothed, the teeth oblique with a lunulate sinus; monœcious; perianth oblong-triangular, lacinate; antheridia 2–3 in a cluster, axillary.—On rocks in shady rills; not common.

Prostrate, with ventral runners; leaves flat, subcontiguous or imbricate, obliquely round-ovate, minutely 2-toothed with a lunulate sinus, abruptly decurrent; cells large, uniform; underleaves minute, the upper orbicular, bifid, the lower twice 2-lobed, the primary lobes round-quadrate, divaricate, the secondary ovate or subulate.

Lunulate: a line, when made up of a series of small lunules.

Flosculus: a small, tubular lunulate anal organ with a central style, in certain Fulgorids.