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FOC | Family List | FOC Vol. 2-3 | Dryopteridaceae | Arachniodes

31. Arachniodes assamica (Kuhn) Ohwi, J. Jap. Bot. 37: 76. 1962.

西南复叶耳蕨 xi nan fu ye er jue

Aspidium assamicum Kuhn, Linnaea 36: 108. 1869; Arachniodes basipinnata (Ching) Ching & Y. T. Hsieh; A. leuconeura Ching; A. suijiangensis Ching & Y. T. Hsieh; A. xinpingensis Ching; A. yaomashanensis Ching; Aspidium aristatum (G. Forster) Swartz var. assamicum (Kuhn) Baker; Byrsopteris assamica (Kuhn) C. V. Morton; Dryopteris assamica (Kuhn) Rosenstock; D. speciosa (D. Don) C. Christensen var. assamica (Kuhn) C. Christensen; Polystichopsis assamica (Kuhn) Tagawa; Polystichum assamicum (Kuhn) Ching; Rumohra assamica (Kuhn) Ching; R. assamica f. basipinnata Ching.

Rhizome creeping, succulent at growing apex, 1.5-2 cm in diam., moderately scaly; scales pale brown, broadly lanceolate or ovate-subulate, 5-12 × 1.5-3.5 mm, thin and soft. Fronds approximate or remote, 0.5-1.2 m; stipe stramineous, 25-65 cm, 3-5 mm in diam., bases scaly as rhizome, upward scales diminishing to glabrescent; lamina 2-pinnate-pinnatifid, pale green when dried, ovate-deltoid, 25-60 × 20-50 cm, papery, base broadly cuneate, apex acuminate with a conform or nearly conform terminal pinna, rachis glabrescent; pinnae (1 or)2-4(-6) pairs, alternate, with 1-3 cm stalk, 5-10 cm apart, obliquely spreading; lowest pinna deltoid-lanceolate, 25-30 × 10-14 cm, base broadly cuneate, apex acuminate; primary pinnules 8-12 pairs, shortly stalked, spreading or slightly ascending, rhombic-lanceolate, occasionally falcate, 5-10 × 1.5-3.5 cm, base unequally cuneate, apex acuminate, margin pinnatifid; basal basiscopic primary pinnule sometimes elongated and pinnate; lobes with apex acute or acuminate, margin serrate with mucronate teeth; upper pinnae broadly lanceolate. Sori large, terminal on veinlets, 5-10 pairs per ultimate pinnule, medial or closer to midvein; indusia brown, firmly membranous, entire.

Along streams in dense woods, bamboos, or shrubs; (700-)1200-2500 m. Chongqing, Guangxi, Guizhou, Sichuan, Yunnan [NE India, Myanmar, Nepal, N Thailand, N Vietnam].

Rumohra assamica f. simplicipinnata Ching (Sinensia 5(1-2): 49. 1934 ["simplici-pinnata"]), described from China, may belong here.


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