小叶卷柏 xiao ye juan bai

Plants terrestrial, seasonally green, erect, generally less than 10 cm, stramineous, glabrous. Rhizophores restricted to base of stem. Main stem pinnately branched, stramineous, branched from lower part, 0.4-0.7 mm in diam. in basal part, leaves on lower part of main stems or below leafy portion distant, with single vascular bundle; primary leafy branches 3-5 pairs, forked, branchlets sparse, middle primary branches ca. 3 cm, ca. 2 cm wide, leafy branches glabrous, dorsiventrally flattened, ultimate branches 1.5-2.5 mm wide including leaves. Leaves decussately arranged except on unbranched main stem, dimorphic throughout, herbaceous, white-margined, entire. Dorsal leaves asymmetrical; dorsal leaves on branches elliptic, ca. 1.2 × 0.4 mm, base cuneate, margin denticulate, apex long acuminate. Ventral leaves asymmetrical; ventral leaves on branches ascending, approximate, oblong, ca. 2 × 1.5 mm, apex acute; acroscopic base rounded, decurrent, margin denticulate. Strobili solitary, terminal, compact, dorsiventrally complanate, ca. 5 × 2.5 mm; sporophylls strongly dimorphic, resupinate; dorsal sporophylls ovate, margin denticulate, apex acute, with sporophyll-pteryx incomplete, ciliate; ventral sporophylls ovate, margin denticulate or ciliate; megasporangia usually in basal portion on lower side or megasporangia in basal portion of both sides; microspores orange-red, megaspores yellow.

On soil banks in shaded forests; 100-1300 m. Yunnan [India (Assam), Malaysia, Myanmar, Thailand, Vietnam].