Selaginella pseudonipponica

Plants epilithic, seasonally green, creeping; fertile stems erect, 5-15 cm. Rhizophores at intervals throughout length of creeping stem and branches, borne on ventral side in axils of branches. Main stems branched throughout, stramineous, ca. 0.2 mm in diam. in lower part, angulate, sulcate, glabrous; primary leafy branches of creeping sterile stems 3-5 pairs, sparsely once pinnately branched, branchlets sparse, adjacent primary branches on main stem 1-1.7 cm apart, leafy branches and stems dorsiventrally flattened, leafy portion of main stem including leaves 3-4 mm wide at middle, ultimate branches 3.2-3.4 mm wide including leaves. Axillary leaves on branches usually symmetrical or asymmetrical, 1.2-1.6 × 0.4-0.8 mm, base exauriculate, margin ciliolate. Dorsal leaves ± symmetrical, those on main stems not obviously larger than those on branches; dorsal leaves on branches oblong-ovate or elliptic, 1.2-1.6 × 0.5-0.8 mm, base obtuse, margin ciliolate, apex acuminate, sometimes reflexed. Ventral leaves asymmetrical, those on main stem not obviously larger than those on branches; ventral leaves on branches spreading or deflexed, broadly ovate or ovate-triangular, 1.7-2.2 × 0.8-1.3 mm, apex acute; acroscopic base enlarged, broader, overlapping stem and branches, margin irregularly shortly ciliolate. Fertile branches erect, 2-4.7 cm including strobili. Strobili solitary or forked, terminal, lax in lower portion, compact in upper portion, dorsiventrally complanate, 8-22 × 2.4-4.6 mm; sporophylls similar to sterile leaves in form and arrangement, slightly dimorphic, obscurely non-resupinate, not keeled, not white-margined, margin ciliolate, apex acuminate or slightly aristate; megasporophylls in basal portion on lower side of strobilus or megasporophylls and microsporophylls at intervals; microsporangia elliptic, relatively thick, with relatively large cells at central part; microspores orange-red, megaspores sulfur-colored, irregularly reticulate.