Family

Thelypteridaceae

Nomenclature

Thelypteris confluens (Thunb.) C.V.Morton, Contr. U.S. Natl. Herb. 38: 71. 1967; Holttum, Fl. Males., Ser. II, Pterid. 1:377, f. 5g–h. 1982 [‘1981’]; Tagawa & K.Iwats., Fl. Thailand 3: 401, f. 39.1–5. 1988; Boonkerd & Pollawatn, Pterid. Thailand: 230. 2000. – Pteris confluens Thunb., Prodr. Pl. Cap.: 171. 1800. – Type: Thunberg, South Africa, Cape of Good Hope (UPS).

Nephrodium squamulosum Hook.f., Fl. N.Z. 2: 39. 1854. – Thelypteris squamulosa (Hook.f.) Ching, Bull. Fan Mem. Inst. Biol. 6: 5, 329. 1936; Holttum, Dansk Bot. Ark. 20: 22. 1961.

Thelypteris palustris Salisb. var. squamigera (Schlecht.) Tardieu, Mém. Inst. Franç. Afrique Noire 28: 119, t. 20, t. 7-9. 1953.

Description

Rhizome long creeping, with distant fronds; scales oblong with long tails, sparsely hairy at margin, 2 by 0.8 mm, pale brown. Stipes stramineous with dark base, about 20 cm long. Laminae oblong-lanceolate, acute at apex, up to 25 by 8 cm wide, pinnate; lateral pinnae lanceolate, acute at apex, shortly stalked, pinnatisect, up to 7 by 1.2 cm; segments oblong, oblique, moderately acute at apex; rachis and costa scaly underneath with broad pale brown membranous scales; veins pinnate, veinlets forked or simple, reaching the margin of lobes. Sori dorsal on veinlets, round, sometimes adhering to the next at maturity; indusia round-reniform, hairy at margin .

Distribution in Thailand

NORTHERN: Chiang Mai.

Distribution in Laos

Unspecified.

Wider Distribution

Africa, S India, Burma, Laos, Sumatra, New Guinea, and New Zealand.

Ecology

In swamps in rather open places at about 1000 m alt.

Proposed IUCN Conservation Assessment

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