Tectaria polymorpha (Wall. ex Hook.) Copel.
Tectaria polymorpha (Wall. ex Hook.) Copel., Philipp. J. Sci., Sect. C, Botany 2: 413. 1907; C.Chr., Contr. U.S. Natl. Herb. 26: 330. 1931; Ching, Sinensia 2: 30. 1931; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 417. 1941, p.p.; Holttum, Dansk Bot. Ark. 20: 31. 1961; Holttum, Dansk Bot. Ark 23: 240. 1965; Tagawa & K.Iwats., SouthE. Asian Stud. 5:99. 1967; Tagawa & K.Iwats., ActaPhytotax. Geobot. 23: 56. 1968; Tagawa & K.Iwats., Fl. Thailand 3: 378. 1988; Holttum, Fl. Males., Ser. II, Pterid. 2: 87. 1991; Boonkerd & Pollawatn, Pterid. Thailand: 215. 2000. – Aspidium polymorphum Wall. ex Hook., Sp. Fil. 4: 54. 1862; Bedd., Handb. Ferns Brit. India: 218. 1883. – Type: Wallich 382, Nepal (K; iso BM).
Rhizome short, ascending to suberect; scales linear-subtriangular, about 10 by 2 mm, brown, stiff, margins pale and thin and about 0.3 mm broad. Stipes stramineous to brown, densely pubescent on adaxial surface, glabrescent beneath, 30–80 cm long. Laminae imparipinnate, ovate-oblong, 30–60 by 30–50 cm; rachis densely pubescent on upper surface, glabrescent beneath; lateral pinnae oblong-lanceolate, caudate at apex, cuneate to rounded at base, shortly stalked or sessile, broadest at 1/3 way from apex; usually about 20 by 5 cm, or up to 30 by 10 cm, subentire or rarely coarsely dentate, or each basal pinna sometimes with single large basiscopic lobe, terminal pinna a little larger, broadest at 2/3 way from apex, up to 20 by 6–10 cm, papyraceous, green, glabrous; costa and main veins distinctly raised beneath, shortly pubescent, veins copiously anastomosing, main areoles distinct including two rows of smaller areoles with free included veinlets, all veinlets raised beneath, glabrous. Sori on cross veins or sometimes on included free veins, irregularly scattered on lower surface of pinnae, round, about 1 mm diam.; indusia small, fugacious, pubescent .
Distribution in Thailand
NORTHERN: Chiang Mai, Chiang Rai, Tak, Phitsanulok, Nakhon Sawan; NORTH-EASTERN: Loei; SOUTH-WESTERN: Kanchanaburi, Phetchaburi; CENTRAL: Saraburi, Nakhon Nayok; SOUTH-EASTERN: Chanthaburi; PENINSULAR: Chumphon, Surat Thani, Nakhon Si Thammarat, Trang, Yala.
Distribution in Cambodia
E Himalaya to S China and Taiwan, south to Sri Lanka and W Malaysia.
On mountain slopes usually in dry places in dense forests at low to medium altitudes up to 1400 m alt.
Proposed IUCN Conservation Assessment
Least Concern (LC). This species is widespread and not under any known threat.
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