Lepisorus nudus (Hook.) Ching
Lepisorus nudus (Hook.) Ching, Bull. Fan Mem. Inst. Biol. 4: 83. 1933; Holttum, Dansk Bot. Ark. 20: 19. 1961; Tagawa & K.Iwats., Fl. Thailand 3: 512, f. 51.4. 1989; Boonkerd & Pollawatn, Pterid. Thailand: 274. 2000. – Pleopeltis nuda Hook., Exot. Fl. 1: t. 63. 1823; Tagawa, J. Jap. Bot. 38: 326. 1963; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 50. 1967.
Pleopeltis linearis auct. non (Thunb.) Kaulf.: Bedd., Handb. Ferns Brit. India: 346, f. 194. 1883, p.p.
Lepisorus sp.: Holttum, Dansk Bot. Ark. 20: 19. 1961.
Lepisorus macrosphaerus auct. non (Baker) Ching: Holttum, Dansk Bot. Ark. 23: 230. 1965.
Rhizome long creeping, 1.5–2 mm diam., green on surface, bearing fronds rather remotely, scaly throughout; scales ovate-oblong with gradually narrowing attenuate apex, up to 4 by 1 mm, concolorously light brown, clathrate, entire. Stipes 2–7 cm long, stramineous, castaneous or dark, winged on the upper part, scaly at base. Laminae linear, broadest usually at middle portion, linear-lanceolate, gradually narrowing towards both long-attenuate ends, up to 32 by 2.4 cm, entire or a little revolute at margin; coriaceous, minutely and sparsely scaly underneath. Sori medial, round or oblong or a little obliquely elongate, up to 4.5 mm broad, more or less raised, hollowing on upper surface. Spores monolete .
Distribution in Thailand
NORTHERN: Chiang Mai, Chiang Rai, Tak; NORTH-EASTERN: Loei; SOUTH-EASTERN: Chanthaburi.
Sri Lanka, S India, Himalayas, Upper Burma to SW China (Yunnan).
On mossy tree trunks or on branches of trees usually in dense evergreen forests at high altitudes.
Proposed IUCN Conservation Assessment
Least Concern (LC). This species is widespread and not under any known threat.
Voucher specimens - Thailand
Middleton et al. 4865 & 4866, Chiang Mai, Doi Suthep-Doi Pui National Park (E); Middleton et al. 5022, Chiang Mai, c.5 km south of Doi Ang Khang (E).
Tip of rhizome with scales
Variation in upper leaf surface
Lower frond surface
Scales on lower frond surface
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