百山祖双盖蕨 bai shan zu shuang gai jue

Basionym: Allantodia baishanzuensis Ching & P. S. Chiu, Acta Phytotax. Sin. 36: 375. 1998.

Fertile fronds up to 80 cm; stipe stramineous, up to 33 cm, 1-2 mm in diam., base slightly scaly; scales brown, lanceolate or linear, entire; lamina 1-pinnate with pinnules pinnatilobate or base nearly 2-pinnate, ovate-deltoid, up to 45 × 30 cm, base subtruncate, apex acuminate; pinnae up to 10 pairs, alternate or subopposite, slightly ascending; basal pinnae oblong-lanceolate, base slightly cordate, with stalk up to 1 cm; upper pinnae lanceolate, base broadly cuneate, sessile or shortly stalked; basal pinnae larger, up to 20 × 7 cm, pinnatipartite to pinnatisect, middle basiscopic lobes longer; lobes oblong or ovate-oblong, margin crenate, sometimes shallowly pinnatilobate, apex rounded; veins slightly visible on adaxial surface, prominent abaxially, veinlets up to 10 pairs, simple or forked, sometimes pinnate. Lamina submembranous when dry, green, dark on adaxial surface, glabrous, abaxial side with brown scales. Sori shortly linear, mostly single, medial-intramedial; indusia brown, membranous, entire.

● S Zhejiang (Baizu Shan, Qingyuan).

Diplazium baishanzuense is similar to D. squamigerum but differs by the lamina longer than wide, 1-pinnate with pinnatipartite pinnules or base nearly 2-pinnate, upper part of stipe and rachis subglabrous, and scales entire.