美丽双盖蕨 mei li shuang gai jue

Asplenium bellum C. B. Clarke, Trans. Linn. Soc. London, Bot. 1: 496. 1880; Allantodia bella (C. B. Clarke) Ching; Asplenium umbrosum Schrader var. bellum (C. B. Clarke) Hosseus; Athyrium bellum (C. B. Clarke) Ching.

Plants evergreen, large. Rhizome ascending to erect, up to 30 cm tall, ca. 5 cm in diam., apex and base of stipe with brown lanceolate scales; scales up to 15 mm, margin entire; fronds caespitose. Fertile fronds longer than 2 m; stipe light brown, up to 1 m, ca. 6 mm in diam., scaly in lower part, rough; lamina bipinnate-pinnatipartite below apex, deltoid, up to 1 m × 70 cm wide at base, apex acuminate and pinnatipartite; pinnae up to 18 pairs, lower pinnae opposite, upper pinnae alternate, spreading; lower pinnae ca. 10 cm apart, oblong-lanceolate, up to 40 × 20 cm, subsessile, base truncate, apex acuminate; pinnules ca. 15 pairs per pinna, spreading, ca. 10 × 2 cm, with stalk ca. 1 mm, base truncate, pinnatipartite, apex long acuminate; pinnule lobes up to 14 pairs per pinnule, slightly oblique, contiguous, slightly falcate, oblong, up to 1.2 × 5 mm, margin regularly shallowly toothed, apex rounded or acute; veins not distinct, pinnate, veinlets 7 or 8 pairs per lobe, 2 per tooth, bifurcate, oblique. Lamina leathery, glabrous on both surfaces; rachis and costae light brown or green-brown, sulcate on adaxial side. Sori 4 or 5 pairs per lobe, near midribs, elliptic, 1-1.5 mm; indusia brown, elliptic, vaulted, thickly membranous, irregularly dehiscing on back surface when mature. Spores brown, elliptic, perispores indistinct, with granular ornamentation.

Valley forests; 1400-2100 m. Yunnan [Bhutan, India, Myanmar].