斜生对囊蕨 xie sheng dui nang jue

Athyriopsis dickasonii (M. Kato) W. M. Chu; A. hunanensis Z. R. Wang & S. F. Wu.

Rhizome ascending, up to 2 cm in diam. including remaining stipe bases, apex and stipe base with sparse light brown, ovate-lanceolate scales up to 1 cm; fronds 2-5, caespitose; lamina subdimorphic. Fertile frond up to 70 cm; stipe brown at base, upward (and rachis) light brown or green-stramineous, up to 35 cm, 1-2 mm in diam., upper part with sparse deciduous scales; lamina ovate to narrowly ovate, up to 35 × 20 cm, apex acuminate, or abruptly narrowed then acuminate; free pinnae 6-14 pairs, linear-lanceolate or narrowly elliptic-lanceolate, up to 10 × 2 cm, base truncate, pinnatipartite, apex acuminate or long acuminate, sometimes slightly abruptly narrowed, then acuminate; pinna lobes up to 14 pairs, slightly ascending, contiguous, rectangular or oblong, margin sparsely shallowly crenate, shallowly repand, or entire, apex rounded or subtruncate; veins pinnate per lobe; veinlets up to 6(or 7) pairs, simple or forked. Lamina herbaceous, dark green or brown-green on adaxial surface when dry, light green on abaxial surface; rachis with dense thin light yellow-brown, multicellular hairs and hairlike scales, costa and veins also with similar nodose hairs, abaxial surface of lamina between veinlets with sparse gray-white short nodose hairs. Sori narrowly oblong or oblong, slightly curved or straight, mostly single, medial-supramedial, double on basal acroscopic veinlets, up to 5 pairs per each lobe; indusia light brown, membranous, margin flat when young, slightly dentate or subentire, with sparse thin short hairs. Spores orbicular in polar view, semicircular in equatorial view, perispore not hyaline, with densely clavate and thinly aculeate projections.

Broad-leaved forests; 1400-2300 m. Guizhou (Suiyang), Hunan (Sangzhi), Yunnan [Myanmar].

Deparia dickasonii is similar to D. minamitanii Serizawa of Kyushu, Japan, in the prominently subdimorphic fronds and the sterile fronds with short stipes, but it differs by its scales on the stipe base ovate-lanceolate, up to 1 cm, and lamina of fertile frond as long as the stipe or longer (vs. scales lanceolate, up to 5 mm, and lamina of fertile frond considerably shorter than the stipe in D. minamitanii). The sterile fronds of D. dickasonii number 1 or 2 per plant, while those of D. minamitanii number up to 5.