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Plant creeping, often forming loose mats. Stems prostrate, primary branches often irregularly ascendent, 1-to 3-furcate; leafy stem radially symmetrical or occasionally slightly dorsiventral in position of leaves. Leaves herbaceous, often brown and papyraceous below, narrowly deltate to linear or subulate, 1.5-2.25 x 0.25 mm, adnate basally, margins with piliform cilia, acuminate apically, tapering into a usually curved opaque seta A to Vi as long as blade. Strobili suberect, dorsiventral, 4-8 mm long; sporophylls in 2 ranks on under side, broader and more lanceolate than leaves, apex not setose. Megaspores subgranulate, 350-440 µm, triradiate ridges indistinct. Microspores scabrate, 40-50 µm.
Stems widely creeping, often forming dense mats, anisotomously branched, branches up to 0.5 mm in diam., lateral branches prostrate or ascending, up to 35 mm tall. Lycophylls ligulate, greyish, coriaceous, narrowly lanceolate-aristate, closely imbricate, margins variously fimbriate, up to 2.5 x 0.2 mm. Strobili up to 14 mm long, heterophyllous, terminal on ultimate branches, sporophylls anisophyllous. Sporophylls coriaceous, dorsally in 2 ranks, ovate-acuminate, up to 2.5 x 1.25 mm, ciliate, aristate, abaxially with a groove along vein. Sporangia sessile, reniform, anisovalvate, up to 1 mm in diam.
Terrestrial or epilithic, mat-forming perennial. Stems widely creeping, branched, primary branches prostrate or ascending. Leaves spirally arranged, grey-green when living or wet, turning silver-grey when dry, up to 2 x 0.25 mm; sporophylls distinct from sterile leaves, in 2 ranks adjacent to 2 rows of sterile leaves.
A creeping, perennial plant. Leaves of all branch systems ± similar, crowded, subulate, aristate, greyish green. Seta on leaf apex one-third or more the length of blade, white and opaque. Sporophylls in 2 ranks.
