Prosaptia barathrophylla (Baker) M.G.Price
Prosaptia barathrophylla (Baker) M.G.Price, Contr. Univ. Michigan Herb. 17: 276. 1990; Parris, Fl. Pen. Malaysia, Ser. I, Ferns & Lycoph. 1: 174. 2010. – Polypodium barathrophyllum Baker, J. Bot. 29: 107. 1891. – Ctenopteris barathrophylla (Baker) Parris, Fern Gaz. 12: 118. 1980. – Type: Hose s.n., Borneo, Sarawak, G. Mulu ("Mt Niulu") (holotype K; isotype SAR).
Prosaptia khasyana auct. non (Hook.) C.Chr. & Tardieu: Tardieu & C.Chr., Fl. Indo-Chine 7(2): 531. 1941; Tagawa & K.Iwats., Fl. Thailand 3: 591. 1989; Boonkerd & Pollawatn, Pterid. Thailand: 243, 244, 293. 2000. – Ctenopteris khasyana auct. non (Hook.) Copel.: Holttum, Rev. Fl. Malaya ed. 1, 2: 233, f. 134. 1955 [‘1954’]; Holttum, Dansk Bot. Ark. 20: 21. 1961; Holttum, Dansk Bot. Ark 23: 232. 1965.
Rhizome short, ascending, bearing a tuft of fronds at apex, scaly; scales oblong-subdeltoid, about 3 by 1.2 mm, pale brown, pubescent at margin. Stipes very stout, castaneous, densely pubescent, to 1 cm long. Laminae narrowly lanceolate, gradually narrowing towards both ends, (11–)20–40(–51) by up to 1–3(–4.2) cm, deeply lobed to midrib with a wing 1–2 mm in breadth at each side; lobes oblique, oblong-subtriangular, moderately acute at apex, entire, the lower ones gradually reducing in length, the upper ones gradually becoming smaller upwards, the middle largest ones 5–20 x 2–6 mm; thinly leathery, veins simple, the lowest basiscopic ones usually running directly from midrib, the upper surface glabrous or very sparsely hairy, the margin and lower surface hairy, marginal hairs sometimes in a tuft, setose, dark brown. Sori terminal on veins, round to subelliptic, medial or nearly so, sunk in cavities without prominent edges.
Distribution in Thailand
NORTH-EASTERN: Loei; SOUTH-WESTERN: Prachuap Khiri Khan; SOUTH-EASTERN: Prachin Buri; PENINSULAR: Phangnga, Krabi.
Distribution in Cambodia
Indochina, S China, western Malesia, Philippines and Sulawesi.
On muddy cliffs along streams in dense evergreen forests at medium altitudes (500–1500 m) or epiphytic on tree trunks.
Proposed IUCN Conservation Assessment
Least Concern (LC). This species is widespread and not under any known threat. It is listed as Near Threatened in the Flora of Peninsular Malaysia.
Voucher specimens - Thailand
Charoenphol et al. 4276, Prachin Buri, Khao Yai NP (P).
Voucher specimens - Cambodia
Pierre s.n., Kampot, Kamchay (P); Bouillod 66, Kampot, Kamchay (P); Tixier 4865, Kampot, Bokor (P).
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