Leptochilus decurrens Blume
Leptochilus decurrens Blume, Enum. Pl. Javae: 206. 1828; Ching, Bull. Fan Mem. Inst. Biol. 4: 345. 1933; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 502. 1941; Holttum, Rev. Fl. Malaya ed. 1, 2: 164, f. 74. 1955 [‘1954’]; Tagawa, J. Jap. Bot. 38: 328. 1963; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 55. 1967; Tagawa & K.Iwats., Fl. Thailand 3: 542, f. 54.7. 1989; Nooteboom, Blumea 42: 279. 1997; Nooteboom, Fl. Males., Ser. II, Ferns and Fern Allies 3: 83. 1998; Boonkerd & Pollawatn, Pterid. Thailand: 276. 2000; Newman et al., Checkl. Vasc. Pl. Lao PDR: 30. 2007. – Type: Blume s.n. (L).
Acrostichum variabile Hook., Sp. Fil. 5: 277. 1864; Hosseus, Beih. Bot. Centr. 28(2): 363. 1911. – Gymnopteris variabilis (Hook.) Bedd., Ferns Brit. India: t. 272. 1868; Bedd., Handb. Ferns Brit. India: 429, f. 258. 1883.
Rhizome long creeping, 2.5–3 mm diam., bearing fronds to 1 cm apart, scaly throughout; scales pseudopeltate, narrowly ovate or triangular, gradually narrowing from base towards long-attenuate apex, 2–3(–5) by 0.3–1 mm, distinctly clathrate, concolorously brown, margin minutely toothed. Fronds dimorphic. Sterile fronds: stipes up to 0–15(–18) cm long, more or less winged at least in the upper part, sparsely scaly in lower portion, stramineous; laminae oblong to oblong-lanceolate, broadest near base, round or broadly cuneate at base and decurrent downwards to form wings of stipes, gradually narrowing upwards and then caudately acuminate at apex, up to 10–30(–50) by 2.5–11 cm, entire or irregularly undulate at margin; midrib raised on both surfaces; main lateral veins distinct, the other veins visible, forming copious areoles with forked or branched included free veinlets; dark green, dark in dried condition. Fertile fronds: stipes 14–40(–50) cm long, stramineous, wingless; laminae linear, up to 30 by 0.1–0.3(–1) cm broad, wholly covered by sporangia except on the midrib. Spores monolete .
Distribution in Thailand
NORTHERN: Mae Hong Son, Chiang Mai, Chiang Rai, Lamphun, Lampang, Phrae; NORTH-EASTERN: Phetchabun, Loei; SOUTH-WESTERN: Uthai Thani, Kanchanaburi; SOUTH-EASTERN: Chanthaburi; PENINSULAR: Nakhon Si Thammarat.
Distribution in Laos
Sri Lanka, S India, N India, S China and Taiwan, Vietnam, throughout Malesia.
Proposed IUCN Conservation Assessment
Least Concern (LC). This species is widespread and not under any known threat.
Voucher specimens - Thailand
Middleton et al. 5167, Loei, Phu Luang Wildlife Sanctuary (E).
Rhizome and stipe bases
Upper sterile frond surface
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