Haplopteris ensiformis (Sw.) E.H.Crane
Pteridaceae, subfamily Vittarioideae
Haplopteris ensiformis (Sw.) E.H.Crane, Syst. Bot. 22: 514. 1998 [‘1997’]. – Vittaria ensiformis Sw., Ges. Naturf. Freunde Berlin Neu. Schr. 2: 134, t. 7, f. 1. 1799; Holttum, Rev. Fl. Malaya ed. 1, 2: 613, f. 359. 1955 [‘1954’]; Holttum, Dansk Bot. Ark. 20: 34. 1961; Tagawa & K.Iwats., Fl. Thailand 3: 223. 1985; Boonkerd & Pollawatn, Pterid. Thailand: 135. 2000.
Vittaria hainanensis C.Chr. ex Ching, Sinensia 1: 182, pl. 1. 1931; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 198. 1940.
Rhizome short creeping, slender, 0.7–1.5 mm diam., densely covered with a mass of roots, scaly throughout; scales linear, gradually narrowing from base towards tailed apex, up to 7 by 0.7 mm, dark brown to nearly black, clathrate, minutely toothed at margin. Stipes usually indistinct, narrowly winged throughout. Laminae linear, up to 40 by 2.5–6 mm, leathery; costa indistinct below or hardly visible on the lower portion, other veins indistinct, the margin sometimes inrolled. Sori immersed in deep grooves almost at margin, usually elongate along both margin of fronds.
Distribution in Thailand
SOUTH-WESTERN: Phetchaburi, Prachuap Khiri Khan; CENTRAL: Bangkok; SOUTH-EASTERN: Chanthaburi, Trat; PENINSULAR: Ranong, Surat Thani, Phangnga, Phuket, Krabi, Nakhon Si Thammarat, Phatthalung, Trang, Satun, Pattani, Yala.
Distribution in Cambodia
Tropics of the Old World, the boundary is not certain.
On tree trunks usually in dense evergreen forests at low or medium altitudes.
Proposed IUCN Conservation Assessment
Least Concern (LC). This species is widespread and not under any known threat.
Voucher specimens - Thailand
Middleton et al. 5413, Phatthalung, Lan Mom Jui Waterfall (E).
Voucher specimens - Cambodia
Viboth R5-41, Koh Kong, Thma Baing (P).
Mature (green) and young (red) fronds
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