Cyclosorus siamensis (Tagawa & K.Iwats.) Panigrahi
Cyclosorus siamensis (Tagawa & K.Iwats.) Panigrahi, Res. J. Pl. Environ. 9: 67. 1993. – Thelypteris siamensis Tagawa & K.Iwats., Acta Phytotax. Geobot. 22: 101, f. 5. 1967; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 65. 1967; Tagawa & K.Iwats., Fl. Thailand 3: 426, f. 44.7–9. 1988. – Christella siamensis (Tagawa & K.Iwats.) Holttum, Kew Bull. 31: 332. 1976; Boonkerd & Pollawatn, Pterid. Thailand: 221. 2000. – Type: Tagawa et al. 1277, Thailand, N. ridge of Phu Luang, 1400 m (KYO).
Rhizome erect; scales linear-lanceolate with long tails, c. 10 by 1.2 mm, sparsely hairy at margin. Stipes densely scaly at base, hirsute throughout, up to 50 cm long. Laminae oblong-lanceolate, acute at apex, up to 40 by 20 cm; a few lower pinnae slightly reduced, deflexed, auricled at acroscopic base, middle larger ones falcate, sessile, linear-lanceolate, long-acuminate at apex, broadly cuneate to truncate at base, up to 11 by 1.8 cm, lobed to 2/3 way to costa; segments oblong, oblique, rounded to moderately acute at apex, entire; papyraceous, hairy on surface; basal veinlets uniting to form goniopteroid venation. Sori medial to supramedial; indusia round-reniform, persistent, densely hirsute .
Distribution in Thailand
NORTHERN: Tak; NORTH-EASTERN: Phetchabun, Loei; PENINSULAR: Surat Thani.
Endemic to Thailand.
In evergreen forests at low to 1400 m alt.
Proposed IUCN Conservation Assessment
Least Concern (LC). This species is fairly widespread and not under any known threat.
Only doubtfully distinct from Cyclosorus hispidulus (Decne.) Ching.
Site hosted by the Royal Botanic Garden Edinburgh. Content managed by Stuart Lindsay, Gardens by the Bay, Singapore and David Middleton, Singapore Botanic Gardens. Last updated 17 January 2018.