Selaginella trachyphylla

Plants terrestrial, evergreen, suberect or ascending from decumbent base, 25-45 cm. Rhizophores branched from base to middle of main stem. Main stems branched from lower part upward, pinnately branched, stramineous, main stem 1-3 mm in diam. in lower part, oval or subquadrangular, 2 or 3 times pinnately branched, adjacent primary branches on main stem 1.5-3.8 cm apart, ultimate branches 4-7 mm wide including leaves. Axillary leaves on branches symmetrical, narrowly ovate to triangular, base exauriculate, margin denticulate. Dorsal leaves on branches approximate or contiguous, oblong-ovate or ovate-elliptic, 1.1-2.7 × 0.4-1.4 mm, strongly carinate, base cuneate, margin denticulate, apex aristate, parallel to axis. Ventral leaves on branches contiguous or overlapping, slightly ascending, oblong-falcate, 3.4-4.3 × 1-1.9 mm, adaxially spinose, apex obtuse, subacute, or apiculate; basiscopic base rounded, margin subentire, denticulate at base; acroscopic base enlarged, broader, overlapping stem and branches, margin denticulate. Strobili in pairs, terminal, compact, tetragonal, 5-30 × 1-2 mm; sporophylls uniform, not obviously white-margined, ovate-triangular, margin denticulate, apex acuminate, without sporophyll-pteryx; microsporangia elliptic-oblong, relatively thick; marginal cells differentiated, longer; microspores pale yellow, megaspores whitish.