Thelypteris viscosa (Baker) Ching




Thelypteris viscosa (Baker) Ching, Bull. Fan Mem. Inst. Biol. 6: 315. 1936; Holttum, Rev. Fl. Malaya ed. 1, 2: 252. 1955 [‘1954’]; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 64. 1967; Tagawa & K.Iwats., Fl. Thailand 3: 404, f. 40.6–8. 1988. – Nephrodium viscosum Baker, Syn. Fil.: 264. 1867. – Lastrea viscosa (Baker) J.Sm. ex Bedd., Ferns Brit. India: t. 334. 1870; Bedd., Handb. Ferns Brit. India: 238. 1883. – Coryphopteris viscosa (Baker) Holttum, Blumea 19: 33. 1971; Holttum, Fl. Males., Ser. II, Pterid. 1: 360. 1982 [‘1981’]; Boonkerd & Pollawatn, Pterid. Thailand: 222. 2000. – Type: Cuming 401, Peninsular Malaysia, Malacca, Mt Ophir (K; BM)

Nephrodium gymnopoda Baker, Trans. Linn. Soc. London, Bot. 4: 252. 1894. – Thelypteris gymnopoda (Baker) C.F.Reed, Phytologia 17: 281. 1968. 1968. – Coryphopteris gymnopoda (Baker) Holttum, Blumea 23: 29. 1976; Holttum, Fl. Males., Ser. II, Pterid. 1: 361. 1982 [‘1981’].


Rhizome erect, often more than 10 cm tall above ground; scales linear-lanceolate, up to 8 by 1.2 mm, brown with irregularly toothed paler margin. Stipes dark. brown to castaneous, pubescent, scaly on lower portion, up to 20 cm long. Laminae narrowly oblong, acute at apex, up to 40 by 15 cm; lower pinnae deflexed, middle pinnae patent or ascending, nearly straight, sessile, lanceolate, acute at apex, truncate at base, up to 8 by 1.8 cm, deeply lobed nearly to costa; costa brown, hairy throughout; segments oblong, patent to oblique or falcate, rounded at apex, crenate at margin, up to 10 by 4 mm; papyraceous, deep green in living plants, brownish when dry; veins pinnate, veinlets simple, hairy. Sori medial; indusia round-reniform or horse-shoe-shaped, or sometimes elongate to form athyrioid sori, glandular .

Distribution in Thailand

PENINSULAR: Surat Thani, Nakhon Si Thammarat.

Wider Distribution

Peninsular Malaysia, Sumatra, Borneo and Philippines.


On clayey ridge in dense evergreen forests at about 1100–1750 m alt., near summit of mountains.

Proposed IUCN Conservation Assessment

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


We follow Tagawa & Iwatsuki’s broader species concept for this species . Holttum in Flora Malesiana recognises both Thelypteris viscosa and Thelypteris gymnopoda and is of the opinion that Thelypteris viscosa is not in Thailand.

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