华中对囊蕨 hua zhong dui nang jue

Lunathyrium shennongense Ching, Boufford & K. H. Shing, J. Arnold Arbor. 64: 21. 1983; L. centrochinense Ching ex K. H. Shing.

Rhizomes stout, erect or ascending, apex together with stipe base with brown or blackish brown, membranous, broadly lanceolate, large scales. Fronds caespitose; fertile fronds (30-) 70(-100) cm; stipe stramineous or reddish brown, (8-)12(-17) cm, 2(-4) mm in diam., grooved adaxially, with sparse, thin, short hairs or subglabrate; lamina pinnate-pinnatipartite, oblanceolate or oblong-oblanceolate, (25-)60-80 × (6-)15-20 cm, base gradually narrowed, apex acuminate; pinnae (15-)20-22 (-30) pairs, lower 6-10 pairs of pinnae gradually shortened; basal pinnae often deltoid, small, auricle ca. 1 cm, subopposite, more widely separated from second basal pinnae; middle pinnae alternate, 1-3 cm apart, spreading or slightly ascending, narrowly lanceolate, (3-)10-12 × 1-2 cm, broadest at base, base subtruncate, sessile, pinnatipartite, apex long acuminate; pinna segments ca. 22 pairs, oblong, middle pinnae (3-)7-8 × 3(-5) mm at base, basal segments slightly longer, margin subentire or crenate, apex rounded-obtuse and crenate. Veins visible on both surfaces, pinnate in segments, 5-7 pairs per segment, simple. Lamina herbaceous when dried, green, rachis and costae abaxially with sparse short multicellular hairs or subglabrate, adaxial surface with sparse brown short hairs. Sori elliptic or shortly linear, 1.5-2 mm, (3 or)4 or 5(or 6) pairs per segment; indusia pale brown, elliptic or shortly linear, occasionally J-shaped in distal parts of lamina and pinnae, margin slightly erose or subentire. Spores bilateral, perispore surface with rugate, rugate-saccate, or papillate processes. 2n = 80*.

● Mountain slopes, forests, wet places; 200-3300 m. Anhui, Guizhou, Hebei, Henan, Hubei, Hunan, Jiangxi, Shaanxi, Sichuan, Yunnan, Zhejiang.

Deparia shennongensis is similar to D. dolosa in the shape of fronds, but the rachis and costae are abaxially shortly hairy or subglabrate (vs. long hairy on both surfaces). This species is diploid, while D. dolosa is tetraploid.