Tapeinidium pinnatum (Cav.) C.Chr.
Tapeinidium pinnatum (Cav.) C.Chr., Index Filic.: 631. 1906; C.Chr., Bot. Tidsskr. 32: 345. 1916; Holttum, Rev. Fl. Malaya ed. 1, 2: 339, f. 196. 1955 [‘1954’]; Ching, Fl. Reipubl. Popularis Sin. 2: 8. 1959; Kramer, Blumea 15: 553. 1968; Kramer, Fl. Males., Ser. II, Pterid. 1: 193. 1971; Kramer, Gard. Bull. Singapore 26: 8. 1972; Tagawa & K.Iwats., Fl. Thailand 3: 146. 1985; Boonkerd & Pollawatn, Pterid. Thailand: 96. 2000. – Davallia pinnata Cav., Icon. (Cavanilles): 277. 1802. – Microlepia pinnata (Cav.) Bedd., Handb. Ferns Brit. India: 64. 1883; Christ, Bot. Tidsskr. 24: 111. 1901.
Rhizome creeping, 2.5–3.5 mm diam., dark brown, bearing close fronds, densely scaly at apex; scales up to 3 by 0.3 mm, brown, rather stiff. Stipes up to 20 cm long, stramineous or brownish, scaly at base, grooved on adaxial surface of upper part. Laminae pinnate, about 40 by 20 cm; rachis stramineous or green, rarely purplish, grooved on upper surface, sharply triangular in cross section; pinnae sessile or basal ones very shortly stalked, more than 25 pairs, 2–3 cm apart in middle, linear, gradually narrowing to moderately acute apex, narrowly cuneate at base, up to 15 cm by 8 mm, shallowly incised to 1/3 way to costa, subcoriaceous; veins one to each lobe, forked, hardly visible. Sori submarginal, terminal on veinlets, 1–3 in each lobe; indusia firm, shallowly half-cup-shaped, attached by base and sides.
Distribution in Thailand
SOUTH-EASTERN: Chanthaburi, Trat; PENINSULAR: Nakhon Si Thammarat, Yala.
S India, W and Central Malesia, north to Taiwan and the Ryukyus.
On sandy banks of streams in shade at low altitudes.
Proposed IUCN Conservation Assessment
Least Concern (LC). This species is common and widespread and not under any known threat.
Voucher specimens - Thailand
Middleton et al. 4671, Chanthaburi, Khao Khitchakut National Park (E); Middleton et al. 4622, Trat, Ko Chang, Trail from Khlong Phlu Ranger Station (E).
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