《Flora of China》|| Athyriaceae || Diplazium ||深绿双盖蕨 Diplazium viridissimum

81. Diplazium viridissimum Christ, Notul. Syst. (Paris). 1: 45. 1909.

深绿双盖蕨 shen lü shuang gai jue

Allantodia austrochinensis Ching; A. phaeolepis (Tagawa) Ching; A. pseudodoederleinii (Hayata) Ching; A. viridissima (Christ) Ching; Diplazium phaeolepis Tagawa; D. pseudodoederleinii Hayata.

Plants evergreen, large, but ontogenetically variable and even small plants fertile. Rhizome ascending to erect, robust, up to 40 cm tall, up to 10 cm in diam., apex densely scaly; scales loose, brown to dark brown, linear-lanceolate, more than 3 cm, membranous, margin black and sparsely toothed, apex linear and long caudate; fronds caespitose. Fronds more than 2 m; stipe black at base, upward stramineous or green-stramineous when dry, usually shorter than lamina, up to 1.2 m, up to 1.5 cm in diam., base with dense scales similar to those on rhizome, upward shallowly grooved adaxially; lamina 2-pinnate with pinnules pinnatipartite, deltoid, up to 1.5 × 1.3 m; pinnae to ca. 15 pairs, alternate, slightly ascending, symmetrical or nearly symmetrical, mostly narrowly lanceolate, basiscopic 2 pairs of pinnae largest, up to 70 × 25 cm, with stalk up to 6 cm; upper pinnae gradually narrowed to lanceolate, sessile, 1-pinnate pinnatipartite; pinnules up to ca. 15 pairs, alternate or nearly so, spreading, deltoid-lanceolate or lanceolate, symmetrical, base broadly cuneate or subtruncate, sometimes slightly shallowly cordate, apex often acuminate to long acuminate; middle pinnules up to 15 × 4 cm, lower pinnules often stalked, stalk up to 3 mm, pinnatilobate to pinnatipartite; pinnule lobes up to ca. 15 pairs, slightly ascending, ovate-oblong, slightly oblique, margin shallowly serrate, apex rounded or subtruncate; veins visible abaxially, not prominent adaxially, pinnate per pinnule lobes, veinlets up to 9 pairs, ascending, usually forked or simple, occasionally 3- or 4-furcate. Lamina herbaceous or thinly herbaceous, gray-green abaxially, green or dark green adaxially, glabrous, costules and midribs with light brown or gray-white small glands; rachis and costa green-stramineous or stramineous, with sparse brown linear scales. Sori shortly linear, from midrib to ca. 2/3 of veinlet length, up to 7 pairs per pinnule lobe, often single or double on basal acroscopic veinlets; indusia ruptured before sori mature. Spores subreniform, perispore prominent, not rugate. 2n = 82.

Broad-leaved forests, beside streamlets; 400-2200 m. Guangdong, Guangxi, Guizhou, Hainan, Sichuan, Taiwan, Xizang, Yunnan [Himalaya, NE India, NE Myanmar, Nepal, Philippines, Vietnam].

The curly tender laminae are used as a wild vegetable in W and NW Yunnan.

Diplazium viridissimum is similar to D. giganteum but differs by the rhizome ascending to erect, often subarborescent, and the pinnules often deltoid-lanceolate, symmetrical or nearly so at base.