Dryopteris scottii (Bedd.) Ching

Family

Dryopteridaceae

Nomenclature

Dryopteris scottii (Bedd.) Ching, Bull. Dept. Biol. Sun Yatsen Univ. 6: 3. 1933; Ching, Bull. Fan Mem. Inst. Biol. 8: 402. 1938; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 310. 1941; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 95. 1967; Tagawa & K.Iwats., Fl. Thailand 3: 346. 1988; Boonkerd & Pollawatn, Pterid. Thailand: 205. 2000. – Polypodium scottii Bedd., Ferns Brit. India: t. 345. 1870. – Phegopteris scottii (Bedd.) Bedd., Suppl. Ferns Brit. Ind.: 19. 1876; Bedd., Handb. Ferns Brit. India: 6: 289, f. 148. 1883.

Description

Rhizome short, erect; scales dense, linear-subtriangular with cordate base and long-tailed apex, up to 15 by 2 mm, dark brown to nearly black, entire. Stipes stramineous, densely scaly at base, more sparsely upwards, up to 30 cm long. Laminae pinnate, oblong-lanceolate, widest at base or just above it, about 45 cm long; rachis grooved above, scaly throughout with narrow, nearly black scales about 5 by 0.2 mm; lateral pinnae usually about 10 pairs, lower pinnae lanceolate, about 12 by 2.7 cm, acuminate at apex, broadly cuneate at sessile base, lobed to 1/5 way towards costa, upper ones becoming smaller, fused to each other to form indistinct apical portion of frond; costa distinct on lower surface, grooved above, glabrous or minutely scaly beneath; lobes subdeltoid, rounded at apex, with a few teeth at margin, up to 4 by 6 mm; chartaceous, green, glabrous; veins pinnate, veinlets simple. Sori in a few indistinct rows near costa, leaving marginal 1/3 of pinna sterile , naked.

Distribution in Thailand

NORTHERN: Chiang Mai, Chiang Rai.

Wider Distribution

N India to Upper Burma, SW China, N Vietnam and Taiwan.

Ecology

On wet ground by streams in dense evergreen forests at about 1600 m alt.

Proposed IUCN Conservation Assessment

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

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