Cyclosorus salicifolius (Wall. ex Hook.) Copel.

Family

Thelypteridaceae

Nomenclature

Cyclosorus salicifolius (Wall. ex Hook.) Copel., Gen. Fil. 143. 1947. – Meniscium salicifolium Wall. ex Hook., Icon. Pl. 10: t. 990. 1854. – Phegopteris salicifolia (Wall. ex Hook.) Mett., Fil. Lechl. 2: 22. 1859. – Abacopteris salicifolia (Wall. ex Hook.) Holttum, Rev. Fl. Malaya ed. 1, 2: 288. 1955 [‘1954’]. – Thelypteris salicifolia (Wall. ex Hook.) Reed, Phytologia 17: 311. 1968. – Pronephrium salicifolium (Wall. ex Hook.) Holttum, Blumea 20: 123. 1972; Holttum, Fl. Males., Ser. II, Pterid. 1: 535. 1982 [‘1981’]; Boonkerd & Pollawatn, Pterid. Thailand: 228. 2000. – Type: Wallich 63, Penang (K).

Description

Description updated from Holttum, Fl. Males., Ser. II, Pterid. 1: 535. 1982 [‘1981’].
Rhizome short creeping, 7–8 mm diameter, bearing sparse hooked hairs. Stipes 13–60 cm long; near base a few hooked hairs and rigid dark scales to 10 x 1 mm bearing pale hooked hairs, rest of stipe glabrous, glossy, ± castaneous. Laminae 18.5–80 by 12–28 cm, very firm, indistinctly dimorphic, slightly flushed with red when dry; apex pinna-like, not or little larger than distal pinnae; pinnae 8–18 pairs, a bud sometimes present at base of uppermost pinna; basal pinnae asymmetric at base, the blade decurrent to the attachment to rachis on acroscopic side, ending 5 mm or more from rachis on basiscopic side. Middle pinnae commonly 7–20 by 0.6–2.5 cm; base always very narrowly cuneate; apex narrowly long acuminate; edges quite entire; costules 3–4 mm apart, at 45° to costa; veins 3–10 pairs (according to width of pinna), almost all anastomosing, not prominent on either side, excurrent veins all free except distal ones; both surfaces quite glabrous. Sori supramedial, elongate along veins, those on connivent veins usually meeting; no hairs on body of sporangia and none seen on stalk; spores with a ± continuous wing and cross-wings.

Distribution in Thailand

PENINSULAR: Narathiwat.

Wider Distribution

Peninsular Malaysia, Sumatra, Borneo.

Ecology

On rocks in and beside streams, rheophytic .

Proposed IUCN Conservation Assessment

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

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