濒危等级：根据IUCN的濒危等级评估标准，暂评估该新种为易危（VU）。

模式标本：CHINA, Hainan, Changjiang, Changhua, at foot of Mt. Daling, on quartzite rocky slope, in open grass, 108.700◦ E, 19.328◦ N, altitude 31 m, 10 January 2020, Y. R. Wang and L. X. Yuan wyr20200110 (holotype, PE!); ibid. 11 June 2021, X. C. Zhang and E. F. Huang 11,594 (paratype, PE!).

识别要点：Selaginella iridescens differs from S. pseudotamariscina by its iridescent leaves and apex with long arista (0.35–1.2 mm), dorsal leaves adaxially sulcate, margins of axillary leaves widely membranaceous (ca. 2/3), and main stem slender, dorsiventrally prostrate

形态特征：Description. Rosettes, xerophytic. Rhizophores restricted to base of stem; rhizophores much forked, forming thick massive rootstock. Stems and roots entangled forming prostrate dorsiventral trunks; main stems branched near or above the base, pinnately or anisoto- mously branched, stramineous or brown; primary leafy 2–3 pinnately branched, branchlets compact and regular. Leaves thick and surface smooth, fresh leaves iridescent. Axillary leaves on branches symmetrical, ovate-oblong, ca. 2.02 × 0.87 mm, margin widely mem- branaceous (about 2/3 of the entire leaf), lacerate or subentire, base obtuse, ciliolate or denticulate, apex arista (ca. 0.52 mm long). Dorsal leaves strongly ascending, imbricate, symmetrical, lanceolate, 2.27 × 0.70 mm, lower side sulcate extends to the top, upper side carinate, base obtuse, margin ciliolate or denticulate, not membranaceous, apex arista (ca. 0.76 mm long). Ventral leaves slightly ascending, overlapping, asymmetrical, ovate- lanceolate to ovate-triangular, ca. 2.6 × 1.5 mm, adaxially sulcate extends to the top, apex arista (ca. 0.35–1.20 mm long); basiscopic margin ciliolate or denticulate; acroscopic base enlarged, broader, widely membranaceous, lacerate or subentire, ciliolate or lacerate at base. Strobili solitary, terminal, compact, slightly dorsoventrally complanate, very short (ca. 1–5 mm long); sporophylls anisophyllous; dorsal sporophylls smaller than the ventral ones, symmetrical, lanceolate, ca. 2.0 × 0.8 mm, margin slightly membranaceous, shortly ciliolate, apex arista; ventral sporophylls triangular, ca. 2.21 × 1.30 mm, margin widely membranaceous, denticulate, ciliolate or lacerate, apex arista; sporangia borne only on the ventral sporophylls; microspores yellowish orange, megaspores pale yellow to white

产地：海南岛昌江

生境：石英岩海滩

海拔：海拔30米左右