Lepisorus longifolius (Blume) Holttum
Lepisorus longifolius (Blume) Holttum, Rev. Fl. Malaya ed. 1, 2: 151, f. 65. 1955 [‘1954’]; Tagawa & K.Iwats., Fl. Thailand 3: 508, f. 51.5. 1989; Hovenkamp, Fl. Males., Ser. II, Ferns and Fern Allies 3: 78. 1998; Boonkerd & Pollawatn, Pterid. Thailand: 274. 2000. – Pleopeltis longifolia Blume, Enum. Pl. Javae addend. 1828; Bedd., Handb. Ferns Brit. India: 349, f. 196. 1883; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 50. 1967; Tagawa & K.Iwats., Acta Phytotax. Geobot. 23: 52. 1968. – Paragramma longifolia (Blume) T.Moore, Index Fil.: xxxii. 1857; Copel., Gen. Fil.: 190. 1947. – Type: Blume s.n (L), Java.
Polypodium revolutum C.Chr., Ind. Fil. 331, 559. 1906; Bonap., Notes Ptérid. 14: 65. 1923. – Pleopeltis revoluta (C.Chr.) Alderw., Bull. Dép. Agric. Indes Néerl. 23: 5. 1909. – Phymatodes revoluta (C.Chr.) C.Chr. & Tardieu, Notul. Syst. 8: 190. 1939; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 468. 1941.
Epiphytic or lithophytic, rarely terrestrial. Rhizome short creeping, 3–4.5 mm diam., bearing closely spaced fronds, glaucous on surface, scaly; scales oblong-ovate with attenuate apex, 2.5–4 by 0.8 mm, light brown, more or less clathrate, sharply toothed at margin. Stipes indistinct or up to 8 cm long, scaly at base, stramineous, winged nearly to the very base. Laminae linear, 25–50(–70) by 1–3.5(–4.5) cm, broadest at usually about 1/4 way from base, gradually narrowing towards both ends, attenuate towards but round or pointed at the very apex, attenuate towards base; midrib raised on both surfaces; coriaceous, veins invisible on both surfaces, copiously anastomosing with included free veinlets. Sori usually oblong, occassionally round, up to 10 by 2 mm, in a single row 1-2 mm from the margin, more or less immersed in cavities and densely covered with scale-like paraphyses when young. Spores monolete .
Distribution in Thailand
NORTHERN: Chiang Mai; PENINSULAR: Chumphon, Ranong, Phangnga, Nakhon Si Thammarat, Satun, Yala, Narathiwat.
Distribution in Cambodia
NE India, Burma, W Malesia to the Philippines and Java; there are possible records from New Guinea and Polynesia.
On tree trunks in dense evergreen forests or along streams in light shade, rather common at low altitudes in Peninsular.
Proposed IUCN Conservation Assessment
Least Concern (LC). This species is widespread and not under any known threat.
Voucher specimens - Thailand
Geesink & Santisuk 5392, Nakhon Si Thammarat, Thong Song (P).
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