Family

Thelypteridaceae

Nomenclature

Cyclosorus terminans (J.Sm. ex Hook.) Panigrahi, Pl. Sci. Res. (India) 20(1–2): 25. 1998. – Nephrodium terminans J.Sm. ex Hook., Sp. Fil. 4: 73, 1862. – Amphineuron terminans (J.Sm. ex Hook.) Holttum, Amer. Fern J. 63: 82. 1973; Holttum, Blumea 23: 207. 1977; Holttum, Fl. Males., Ser. II, Pterid. 1: 545, f. 19a. 1982 [‘1981’]; Boonkerd & Pollawatn, Pterid. Thailand: 219. 2000. – Thelypteris terminans (J.Sm. ex Hook.) Tagawa & K.Iwats., Acta Phytotax. Geobot. 26: 169. 1975; Tagawa & K.Iwats., Fl. Thailand 3: 432. 1988. – Amblovenatum terminans (Hook.) J.P.Roux, Strelitzia 23: 201. 2009. – Type: Wallich 386, Burma, Kamoun (= Kumon) (K).

Nephrodium pteroides auct. non (Retz.) J.Sm.: Bedd., Handb. Ferns Brit. India: 269. 1883; Ostenfeld, Bull. Herb. Boiss. II. 5: 721. 1905; Hosseus, Beih. Bot. Centralbl. 28(2): 365. 1911; E.Smith, J. Siam Soc. Nat. Hist. Suppl. 8: 5. 1929. – Dryopteris pteroides auct. non (Retz.) Kuntze .: C.Chr., Contr. U.S. Natl. Herb. 26: 184. 1931.

Cyclosorus interruptus auct. non (Willd.) H.Ito: Ching, Bull. Fan Mem. Inst. Biol. 8: 184. 1938; Tardieu & C.Chr., Fl. Indo-Chine 7(2) 397. 1941; Holttum, Rev. Fl. Malaya ed. 1, 2: 262, f. 149. 1955 [‘1954’]; Holttum, Dansk Bot. Ark. 20: 23. 1961. – Thelypteris interrupta auct. non (Willd.) K.Iwats.: Tagawa & K.Iwats., SouthE. Asian Stud. 3(3): 79. 1965; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 68. 1967.

Cyclosorus extensus auct. non (Blume) Ching: Holttum, Dansk Bot. Ark. 20: 23. 1961.

Thelypteris wagneri Fosberg & Sachet, Smithsonian Contr. Bot. 8: 6. 1972.

Description

Rhizome long creeping, about 1 cm diam.; scales narrow, brown, up to 10 by 0.8 mm, hairy. Stipes 37–84 cm long, stramineous with dark scaly base, pubescent. Laminae oblong-lanceolate, acute at apex, 42–80 by 30–60 cm; lateral pinnae 11–30 pairs, basal pinnae not or little reduced, patent to ascending, lower ones linear, straight, gradually narrowing towards long-acuminate apex, cuneate and shortly stalked at base, 15.5–30 by 1.2–2 cm, lobed to half-way to costa; segments oblong, oblique, round to moderately acute at apex, entire; papyraceous, green; veins pinnate, veinlets simple, basal 1–1.5 pairs uniting with those of the next group below sinus; minutely hairy on veinlets above and beneath, minutely hairy or glabrous on lamina between veins, sessile spherical yellow glands on veinlets and lamina near apex of lobes. Sori confined to upper part of segments, often hollowed; indusia persistent, hairy, sometimes also with yellow spherical glands.

Distribution in Thailand

Common all over Thailand.

Distribution in Cambodia

Mondulkiri.

Wider Distribution

Tropics of Asia to Australia (Queensland).

Ecology

Common on rather dry mountain slopes in forests at low or medium altitudes up to 1200 m alt.

Proposed IUCN Conservation Assessment

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

Voucher specimens - Thailand

Middleton et al. 4729, Chachoengsao, Ang Rue Nai Wildlife Sanctuary (E); Middleton et al. 4609, Trat, Ko Chang, Thanmagon Waterfall (E); Middleton et al. 4631, Trat, Ko Chang, Trail from Khlong Phlu Ranger Station (E); Middleton et al. 4381, Nakhon Si Thammarat, Khao Luang National Park (E).

Voucher specimens - Cambodia

Long et al. CL430, Mondulkiri, close to Bousra Waterwall (P).