松穗卷柏 song sui juan bai

Plants terrestrial, evergreen, main stem shortly decumbent, 1-4(-6) cm, producing a few upright stems over a short distance. Rhizophores restricted to lower part of stem. Main stems branched from near base upward, stramineous, 0.3-0.4 mm in diam. in lower part, angulate, sulcate, repeatedly once or twice forked, branchlets sparse, leafy branches and stems dorsiventrally flattened, ultimate branches 3.2-4.2 mm wide including leaves. Axillary leaves on branches symmetrical, elliptic, 1-1.8 × 0.3-0.7 mm, base exauriculate, margin slightly denticulate. Dorsal leaves ± symmetrical, those on branches not approximate, ovate, 1.2-1.8 × 0.6-0.8 mm, not carinate, base subcordate or obtuse, margin ciliolate, apex acuminate. Ventral leaves asymmetrical, those on branches spreading, ovate-triangular, 1.8-2.3 × 0.8-1.2 mm, apex acute; acroscopic base enlarged, broader, slightly overlapping stem and branches, margin ciliolate. Fertile branches erect. Strobili solitary or forked, terminal, lax, dorsiventrally complanate, 10-20 × 3-5 mm; sporophylls dimorphic, similar to sterile leaves in form and arrangement, non-resupinate; dorsal sporophylls like dorsal sterile leaves, not white-margined, ovate-lanceolate, margin shortly ciliolate, apex acuminate, without sporophyll-pteryx; ventral sporophylls ovate, margin shortly ciliolate; megasporophylls in basal portion on lower side of strobilus; sporangia only distributed on lower side; microsporangia orbicular; microspores orange-red, megaspores orange or yellowish orange.

Damp places in mixed forests, under Quercus shrubs, on rocks, soil banks, rare; 2500-3600 m. Sichuan, Yunnan [India, Nepal].