Cyclosorus sakayensis (Zeiller) Ching

Family

Thelypteridaceae

Nomenclature

Cyclosorus sakayensis (Zeiller) Ching, Bull. Fan Mem. Inst. Biol. Bot. 10: 248. 1941. – Nephrodium sakayense Zeiller, Bull. Soc. Bot. France 32: 75. 1885. – Thelypteris sakayensis (Zeiller) C.F.Reed, Phytologia 17: 311. 1968. – Sphaerostephanos sakayensis (Zeiller) Holttum in B.K.Nayar & S.Kaur, Companion Handb. Ferns Brit. India: 209. 1974. – Chingia sakayensis (Zeiller) Holttum, Fl. Males., Ser. II, Pterid. 1: 392, f. 8c–e. 1982 [‘1981’]. – Type: De Morgan s.n., 6 Aug. 1884, near Gunong Riam, Perak. 750 m (P; K).

Chingia pseudoferox Holttum, Kalikasan 3: 24. 1974.

Cyclosorus ferox auct. non (Blume) Ching: Holttum, Rev. Fl. Malaya ed. 1, 2: 265, f. 51. 1955 [‘1954’]. – Thelypteris ferox auct. non (Blume) Tagawa & K.Iwats.: Tagawa & K.Iwats., Fl. Thailand 3: 403. 1988. – Chingia ferox auct. non (Blume) Holttum: Boonkerd & Pollawatn, Pterid. Thailand: 219. 2000.

Thelypteris paleata auct. non (Copel.) Holttum: Tagawa & K.Iwats., Acta Phytotax. Geobot. 23: 53. 1968, pl. 40. 1–3.

Description

Rhizome erect; scales narrow, 11–16(–20) x 1.2–1.5 mm, hairy, brown. Frond gigantic; stipe stramineous(?), to 200 cm; lamina to 200 cm long, to 70 cm wide; rachis glabrous or sparsely scaly with linear hairy scales; middle lateral pinnae linear, 19–40 by 1.6–3.2 cm, gradually narrowing towards long-acuminate apex, narrowing a little towards truncate base, lobed to 1/4 way towards costa; segments oblong-subdeltoid, moderately acute at apex, entire; papyraceous to thinly chartaceous, firm, glabrous; veins pinnate, the lowest meeting with concurrent veinlets, lower several pairs uniting at long callous membrane below sinus. Sori strictly costular, round, usually confluent along costules at maturity; indusia browh, thin, small but persistent, hairy, glandular at margin .

Distribution in Thailand

PENINSULAR: Yala.

Wider Distribution

Malesia.

Ecology

Terrestrial in forests along streams at 160–500 m alt.

Proposed IUCN Conservation Assessment

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

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