71. Diplazium viridescens Ching, Acta Phytotax. Sin. 8: 167. 1959.
草绿双盖蕨 cao lü shuang gai jue
Allantodia obtusipinnula Ching; A. truncatula Ching; A. viridescens (Ching) Ching.
Plants evergreen, medium-sized. Rhizome erect, black-brown, short, up to 3 cm in diam., with many black-brown, stiff, long and thick roots, apex slightly scaly; scales dark brown, ovate-lanceolate, 3-5 mm, membranous, entire, apex acuminate; fronds few, caespitose. Stipe black-brown at base, upward green-stramineous or pale brown, shorter than lamina, 2-4 mm in diam., base with sparse scales similar to those on rhizome, upward glabrous, shallowly grooved adaxially; lamina 2-pinnate with pinnules pinnatilobate, ovate-deltoid, up to 80 × 50 cm; pinnae up to 10 pairs or more, usually alternate, slightly ascending, symmetrical, upper pinnae lanceolate and pinnatilobate, other pinnae broadly oblong-lanceolate or broadly lanceolate, pinnate, with stalk of basal pinnae up to 3.5 cm; pinnules up to ca. 10 pairs, spreading, alternate, often lanceolate, occasionally narrowly ovate-orbicular, symmetrical or nearly symmetrical, sessile or lower pinnules shortly stalked, apex acuminate or rounded; pinnule lobes up to 10 pairs, ascending, oblong or rectangular, base occasionally reduced, margin entire or shallowly repand to shallowly pinnatilobate, apex rounded or subtruncate; veins prominent abaxially, slightly visible adaxially, pinnate, veinlets simple or forked, up to ca. 7 pairs per pinnule lobe. Lamina grass-green, darker on adaxial surface, thinly papery or papery when dry, with glandular hairs in adaxial grooves except on rachis, elsewhere glabrous; rachis, costae, and costules abaxially usually with brown lanceolate scales. Sori usually linear, inframedial-medial, from costule or near costule up to 3/4 of veinlet length, single or double on basal acroscopic veinlets; indusia light brown when mature, membranous, entire, persistent. Spores bean-shaped, perispore prominent and hyaline, surface glabrous.
● Tropical rain forests; 700-1200 m. Guangxi, Hainan [?Vietnam (near border)].
Diplazium viridescens is variable ontogenetically: small lamina only 30 cm, 1-pinnate pinnatipartite, or lower part 2-pinnate, pinnules rounded at apex.