Family

Lindsaeaceae

Nomenclature

Lindsaea ensifolia Sw., Schrad. J. Bot. 1800(2): 77. 1801; Christ, Bot. Tidsskr. 24: 110. 1901; Hosseus, Beih. Bot. Centralbl. 28(2): 365. 1911; Holttum, Dansk Bot. Ark. 23: 234. 1965; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 74. 1967; Kramer, Fl. Males., Ser. II, Ferns and Fern Allies 3: 211. 1971; Kramer, Gard. Bull. Singapore 26: 32. 1972; Tagawa & K.Iwats., Fl. Thailand 3: 131. 1985; Boonkerd & Pollawatn, Pterid. Thailand: 92. 2000; Newman et al., Checkl. Vasc. Pl. Lao PDR: 27. 2007. – Schizoloma ensfolium (Sw.) J.Sm., J. Bot. 3: 414. 1841; Bedd., Handb. Ferns Brit. India: 80, f. 41. 1883; E.Smith, J. Siam Soc. Nat. Hist. Suppl. 8: 3. 1929; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 129, f. 15.1 & 15.2. 1939; Holttum, Rev. Fl. Malaya ed. 1, 2: 346, f. 200. 1955 [‘1954’]; Holttum, Dansk Bot. Ark. 20: 25. 1961; Seidenf., Nat. Hist. Bull. Siam Soc. 19: 86. 1958; Ching, Fl. Reipubl. Popularis Sin. 2: 273, pl. 23, f. 1–6. 1959.

Lindsaea griffithianum Hook., Sp. Fil. 1: 219, t. 68B. 1846. – Schizoloma griffithianum (Hook.) Fée, Mém. Foug., 5. Gen. Filic.: 108. 1852; C.Chr., Bot. Tidsskr 32: 345. 1916.

Diplazium bantamense auct. non Blume: Christ, Bot. Tidsskr. 24: 108. 1901.

Description

Rhizome creeping, 3–5 mm diam., bearing fronds close together or up to 2 cm apart, brown to darker, scaly at least apically; scales linear, up to 2.5 mm long, 0.3 mm broad, brown, slightly shining. Stipes stramineous or castaneous at least at base. Laminae simply pinnate or rarely simple, ovate to oblong-lanceolate in outline, narrowly ovate with acuminate apex when simple, lateral pinnae (0–)3–7 pairs, linear-lanceolate, caudately acuminate at apex, cuneate, rounded or subtruncate at base, very shortly stalked, entire at margin, up to 20 cm long, 2 cm broad, rather variable, smaller ones about 5 mm broad; terminal pinnae like lateral ones, subcoriaceous; veins anastomosing forming 2–4 rows of areoles at each side of costa, distinct beneath. Sori continuous along margin; indusia firm , nearly reaching the edges.

Distribution in Thailand

NORTHERN: Chiang Mai, Phitsanulok; NORTH-EASTERN: Loei, Nong Khai; EASTERN: Ubon Ratchathani; SOUTH-WESTERN: Kanchanaburi, Phetchaburi; CENTRAL: Nakhon Nayok; SOUTH-EASTERN: Rayong, Chanthaburi, Trat; PENINSULAR: Ranong, Surat Thani, Phangnga, Phuket, Krabi, Nakhon Si Thammarat, Trang, Satun, Yala.

Distribution in Laos

Hua Phan, Vientiane.

Distribution in Cambodia

Kampot, Mondulkiri, Pursat.

Wider Distribution

Old World tropics from W Africa to Australia and Polynesia, north to the Ryukyus.

Ecology

Terrestrial on rather dry slopes or on sandy ground, or rarely on rocks, usually in open areas or in light shade, fairly common and locally abundant throughout Thailand at low to medium altitudes below 1400 m.

Proposed IUCN Conservation Assessment

Least Concern (LC). This species is common and widespread and not under any known threat.

Notes

Extremely variable in the form and size of fronds especially in different habitats; in open sunny places, pinnae become less than 5 mm broad, but in shady places they are more than 2.5 cm broad in the fertile condition; the bases of pinnae are usually broadly cuneate but sometimes narrow or auricled to some extent.

Voucher specimens - Thailand

Middleton et al. 4595, Trat, Ko Chang, Thanmagon Waterfall (E); Middleton et al. 5113, Loei, Phu Suan Sai National Park (E).

Voucher specimens - Laos

Maxwell 99-130, Vientiane (CMU)

Voucher specimens - Cambodia

Long et al. CL478 & CL485, Mondulkiri (P).