Arachniodes chinensis (Rosenst.) Ching

Family

Dryopteridaceae

Nomenclature

Arachniodes chinensis (Rosenst.) Ching, Acta Bot. Sin. 10: 257. 1962; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 93. 1967; Tagawa & K.Iwats., Fl. Thailand 3: 344. 1988; Boonkerd & Pollawatn, Pterid. Thailand: 199. 2000. Polystichum amabile (Blume) J.Sm. var. chinense Rosenst., Repert. Spec. Nov. Regni Veg. 13: 130. 1914. Rumohra chinensis (Rosenst.) Ching, Sinensia 5: 46, pl. 3. 1934; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 322. 1941. Polystichopsis chinensis (Rosenst.) Holttum, Rev. Fl. Malaya ed. 1, 2: 486. 1955 ['1954'].

Description

Terrestrial. Rhizome short creeping, about 6 mm diam.; scales dense, dark brown, up to 8 by 2 mm or narrowerm margin entire. Stipes stramineous, up to 55 cm long, densely scaly throughout; scales on upper portion narrow, dark to black, entire. Laminae oblong with acuminate apex, up to 45 by 30 cm, tripinnate at base, bipinnate to tripinnatifid above base; rachis densely covered with fibrillose blackish scales, grooved on upper surface; lateral pinnae 7–10 pairs, basal pinnae the largest, with large basiscopic and acroscopic pinnules, middle pinnae narrowly subtriangular, straight or slightly falcate, widest at shortly stalked base, gradually narrowing towards caudate-acuminate apex, up to 20 by 5–6 cm; upper pinnae suddenly shortened to form caudate apical portion of frond; pinnules lobed to pinnatisect in larger ones, shortly stalked or sessile, subparallelogram-shaped, acute at apex, more or less auricled at anterior base, subdimidiate at posterior base, 20–30 by 0.7–1.5 mm; ultimate lobes with sharp awns at acuminate apex, entire; chartaceous, glabrous, deep green; midrib of pinnule raised on lower surface, veins pinnate. Sori terminal on veinlets, round; indusia round-reniform , naked.

Distribution in Thailand

NORTHERN: Chiang Rai; NORTH-EASTERN: Loei; SOUTH-EASTERN: Chanthaburi.

Wider Distribution

S & SW China, Indochina and Peninsular Malaysia.

Ecology

On mountain slopes in evergreen forests at medium or high altitudes.

Proposed IUCN Conservation Assessment

Least Concern (LC). This species is widespread and not under any known threats.

Voucher specimens - Thailand

Middleton et al. 4706, Chanthaburi, Khao Soi Dao Wildlife Sanctuary (E).

Rhizome

Rhizome

Frond

Frond

Upper lateral pinna

Upper lateral pinna

Venation

Venation

Lower surface of lamina with old sori

Lower surface of lamina with old sori

Old sori

Old sori

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