STEMS: monomorphic, the main stem prostrate, with prostrate to loosely ascending branches, not readily fragmenting when dry, the branch tips appearing straight when dry, forming loose mats. RHIZOPHORES: produced throughout. LEAVES: monomorphic, 1–2 mm long, narrowly lanceolate to narrowly elliptic-lanceolate, green to dark green when hydrated, the base adnate (differing in color from the stem) and more or less symmetrically rounded or narrowed, the tip bluntly or sharply pointed, with or without a seta, the margins short- to long-ciliate, sometimes mostly denticulate. STROBILI: 6–25 mm long, the sporophylls narrowly ovate to elliptic-ovate or ovate-deltate, narrowed to a blunt or sharply pointed tip with or without a short seta, the margins denticulate to ciliate. MEGASPORES: finely to relatively coarsely rugose-reticulate, orange. NOTES: 2 vars.; WY s to AZ and TX. REFERENCES: Yatskievych, G. and M. D. Windham. 2009. Vascular Plants of Arizona: Selaginellaceae. CANOTIA 5 (1): 39–48.