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1 Stems prostrate, the leaves on the upper and lower side differentiated; rhizophores borne throughout the length of the stem; leaves borne in pseudowhorls of 8 | |
1 Stems erect or ascending, the leaves not differentiated; rhizophores borne only on rhizomatous stems or at the base of aerial stems; leaves borne in pseudowhorls of 4, 5, or 6. | |
3 Stems mostly creeping or turned up at the apex, forming mats 1.5-4 cm high; rhizome or rhizomatous stem absent; aerial roots present all along the stems; budlike “arrested” branches absent | |
3 Stems mostly erect or ascending, forming compact clumps usually > 4 cm high; rhizome or rhizomatous stem present; aerial roots present only at or near the base of the erect stems; budlike “arrested” branches present. | |
4 Leaves of the underground (rhizomatous) stems not scalelike; rhizophores mostly aerial; sporophyll base pubescent; leaf and sporophyll apices often pubescent | |
4 Leaves of the underground (rhizomatous) stems scalelike; rhizophores mostly subterranean; sporophyll base glabrous; leaf and sporophyll apices glabrous. | |
5 Leaves mostly loosely appressed; leaf bases usually glabrescent; strobili not distinctly larger in diameter than the subtending stem; sporophyll apex usually straight |