鳞轴双盖蕨 lin zhou shuang gai jue

Allantodia hirtipes (Christ) Ching; Asplenium parallelosorum Baker; Diplazium insigne Ching (1940), not Holttum (1937); D. parallelosorum (Baker) C. Christensen; D. pellucidum Ching.

Plants evergreen, medium-sized. Rhizome ascending to erect, robust; stipe densely scaly; scales brown, black-brown, or black, shiny, narrowly lanceolate, membranous, toothed at margin. Fronds caespitose; stipe with dense lanceolate black or black-brown scales, grooved adaxially; lamina 1-pinnate, oblong, apex acuminate; pinnae alternate or opposite, subspreading, lanceolate, base cuneate or broadly cuneate, usually enlarged to auriculate at acroscopic and basiscopic bases, sessile, pinnatilobate to pinnatifid, apex acuminate; upper pinnae adnate to rachis, lower pinnae slightly shortened; pinna lobes entire or subentire, truncate or rounded, rarely acute at apex; veins not prominent adaxially, visible abaxially, pinnate, veinlets simple, oblique, all reaching laminar margin. Lamina herbaceous, brown-green when dry; rachis stramineous, with dense linear, brown or black scales, grooved adaxially. Sori linear, slightly curved, usually 1-3 per pinna lobe, simple or forked, from midrib to 2/3 of veinlet length; indusia linear, membranous, entire, persistent. Spores hemispherical, perispore hyaline, wide, few rugate, not prominently granular or rugate.

Dense forests in valleys, beside shaded streamlets; 700-2700 m. Chongqing, Guangxi, Guizhou, Hubei, Hunan, Sichuan, Yunnan [N Vietnam].

Plants with dense black glossy scales on the stipe and rachis have been considered a form of this species: Diplazium hirtipes f. nigropaleaceum (Ching ex W. M. Chu & Z. R. He) Z. R. He, comb. nov. (Basionym: Allantodia hirtipes f. nigropaleacea Ching ex W. M. Chu & Z. R. He, Acta Phytotax. Sin. 36: 379. 1998; 黑鳞鳞轴双盖蕨 hei lin lin zhou shuang gai jue). It occurs in dense forests beside streamlets, 700-1700 m, in Guangxi, Guizhou, Hunan, and Yunnan.