山东对囊蕨 shan dong dui nang jue

Basionym: Athyriopsis shandongensis J. X. Li & Z. C. Ding, Acta Phytotax. Sin. 26: 163. 1988.

Plants summer-green. Rhizome slender, creeping, ca. 2 mm in diam., apex with brown, entire, broadly lanceolate scales; fronds sparse. Lamina subdimorphic; fertile frond larger than sterile, stipe dark brown at base, upward stramineous, up to 30 cm (in sterile frond less than 10 cm), ca. 2 mm in diam. at base, with sparse lanceolate, pale brown, entire, thin scales and nodose hairs; lamina broadly lanceolate, up to 38 × 12 cm, apex acuminate; free pinnae up to 15 pairs, mostly alternate, sessile, lanceolate or falcate-lanceolate, up to 8 × 2.5 cm, base broadly cuneate, slightly asymmetrical, often wider on acroscopic side, pinnatipartite, apex acute or acuminate; pinna lobes up to 10 pairs, rectangular or oblong, apex truncate; lobes rarely lanceolate, margin entire or crenate, apex rounded; veins pinnate with up to 6 pairs of veinlets, veinlets simple or forked, ascending. Lamina herbaceous, green when dry, dark on adaxial surface; rachis stramineous, with sparse brown, lanceolate scales and nodose hairs, both sides of costae and veins sparsely nodose-hairy. Sori shortly linear, mostly straight, usually elliptic when mature, 1-4 pairs per lobe, subbasal, usually single, double on acroscopic basal veinlets; indusia yellow-brown, membranous, margin shallowly erose, incurved when young. Spores elliptic in polar view, semicircular in equatorial view, perispore with irregular auriculate projections.

● Wet areas in forests; 200-500 m. Shandong.

Like Deparia lushanensis, D. shandongensis is endemic to Shandong, the northernmost distributional range of the genus in China. It is distinct from D. lushanensis in the frond, indusia, and spore ornamentation.