二型叶对囊蕨 er xing ye dui nang jue

Diplazium dimorphophyllum Koidzumi, Acta Phytotax. Geobot. 1: 27. 1932; Athyriopsis dimorphophylla (Koidzumi) Ching ex W. M. Chu; Athyrium dimorphophyllum (Koidzumi) Tagawa; A. japonicum (Thunberg) Copeland var. dimorphophyllum (Koidzumi) Ohwi; Lunathyrium dimorphophyllum (Koidzumi) Sa. Kurata.

Plants summer-green. Rhizome long creeping, deep below soil surface, 2-4 mm in diam., apex with dense pale brown, lanceolate or broadly lanceolate, thinly membranous scales; fronds sparse. Lamina prominently subdimorphic, fertile frond larger or stipe prominently longer than sterile; stipe stramineous, 1-2 mm in diam., base densely scaly, scales similar to those on rhizome, upward with sparse narrow scales and multicellular nodose hairs, apical part subshiny, up to 40(-65) cm, in sterile frond less than 30 cm; lamina pinnatilobate, ovate-elliptic, ovate, or narrowly subdeltoid, up to 45(-50) × 25(-28) cm, in sterile frond shorter, apex gradually or abruptly narrowed, acuminate; free pinnae less than 8 pairs, slightly ascending, elliptic-lanceolate or lanceolate, up to 16 × 5 cm, base truncate or broadly cuneate, pinnatipartite, apex acuminate or long acuminate; pinna lobes up to 15 pairs, slightly ascending, ligulate-oblong or falcate-oblong, margin entire, repand, or crenate, apex rounded; veins pinnate with less than 11 pairs of veinlets, veinlets oblique, forked or simple. Lamina herbaceous, green when dry, darker adaxially; rachis and costae with sparse small scales and with nodose hairs, or nearly shiny; veinlets with sparse short nodose hairs or glabrous, lamina between veins with ± pale white or pale brown nodose hairs. Sori linear, straight or slightly curved, 1-10 pairs per lobe, medial or inframedial, mostly single or double on basal acroscopic veinlets; indusia yellow-brown, membranous, hairy, margin lacerate, incurved when young. Spores semicircular or subreniform in equatorial view, perispore surface with dense, thick, uniform, thinly clavate projections. n = 120 (6´).

Forests, forest margins; sea level to 1000 m. Anhui, Guizhou, Henan, Hunan, Jiangxi, Zhejiang [Japan].