钝叶卷柏 dun ye juan bai

Plants terrestrial, evergreen or seasonally green, creeping or suberect, up to 35 cm. Rhizophores restricted to lower part of stem or at intervals throughout length of creeping stem and branches, borne on ventral side in axils of branches. Main stems branched from near base or lower part upward, pinnately branched, stramineous, 1-2 mm in diam. in lower part, terete, not sulcate; primary leafy branches 5-10 pairs, 2 or 3 times pinnately branched, branchlets dense, adjacent primary branches on main stem 1.5-3 cm apart, leafy portion of main stem including leaves 5-8 mm wide at middle, ultimate branches 4-5 mm wide including leaves. Axillary leaves on branches asymmetrical, ovate or triangular, 2-3 × 0.6-1.2 mm, base exauriculate, margin denticulate. Dorsal leaves ± symmetrical, those on main stems not obviously larger than those on branches; dorsal leaves on branches contiguous, ovate-lanceolate or ovate, 1.4-2.2 × 0.4-0.8 mm, not carinate, base obliquely cordate, margin denticulate or ciliolate at base, apex aristate, arista ca. 1 mm. Ventral leaves asymmetrical, those on main stem not obviously larger than those on branches; ventral leaves on branches distant, spreading, oblong, 2.2-3.5 × 1.6-2 mm, apex obtuse or subacute; basiscopic margin sparsely ciliolate at base, elsewhere subentire; acroscopic base enlarged, broader, overlapping stem and branches, margin shortly ciliolate in basal portion, elsewhere entire. Strobili solitary, terminal, compact, dorsiventrally complanate, 3.5-10 × 3.2-4.4 mm; sporophylls strongly dimorphic, resupinate, not obviously white-margined; dorsal sporophylls ovate-lanceolate, carinate, margin ciliolate, apex acuminate, with sporophyll-pteryx incomplete and ciliolate; ventral sporophylls ovate-triangular, carinate, margin ciliolate; megasporophylls in basal portion on lower side of strobilus; microsporangia orbicular, rather thin, cells uniform; microspores orange-red, megaspores yellowish orange or whitish.

Forests; (100-)500-1800 m. Guangxi, Sichuan, Xizang, Yunnan [Myanmar, Thailand].