Cyclosorus larutensis (Bedd.) Ching
Cyclosorus larutensis (Bedd.) Ching, Bull. Fan Mem. Inst. Biol. 10: 245. 1941; Holttum, Rev. Fl. Malaya ed. 1, 2: 284, f. 165. 1955 [‘1954’]. – Nephrodium larutense Bedd., Suppl. Ferns Brit. Ind.: 73. 1892. – Mesochlaena larutensis (Bedd.) Alderw., Malayan Ferns: 232. 1908; Sphaerostephanos larutensis (Bedd.) C.Chr., Index Filic. Suppl. 3: 172. 1934; Holttum, Fl. Males., Ser. II, Pterid. 1: 489, f. 12d–e. 1982 [‘1981’]; Boonkerd & Pollawatn, Pterid. Thailand: 229. 2000. – Thelypteris larutensis (Bedd.) Tagawa & K.Iwats., Acta Phytotax. Geobot. 23: 53. 1968; Tagawa & K.Iwats., Fl. Thailand 3: 417. 1988. – Lectotype (Holttum, Flora Malesiana 1981): Kunstler 2398, Perak, Larut (K).
Rhizome short; scales narrow, hairy. Stipes hairy throughout, scaly near base, bearing reduced pinnae, 40–70 cm to first full-sized pinnae. Laminae oblong-lanceolate, 50–70 by 30–47 cm, 7–14 pairs of full-sized pinnae, with a distinct terminal pinna; middle lateral pinnae narrowly lanceolate, gradually narrowing towards long-acuminate apex, subtruncate to broadly cuneate at sessile base, longest pinnae 19–30 by 2.5–4 cm, lobed to 1/4 way towards costa; segments oblique, round to obtuse at apex, papyraceous, pubescent on both surfaces; rachis and costa hairy, hairs setose, multicellular; veins pinnate, veinlets 10–12 pairs, several basal pairs uniting to form a long excurrent vein, hairy, glandular on under surface. Sori medial, oblong, hardly confluent at maturity; indusia oblong, persistent, up to 1.7 by 0.7 mm, bearing round, red, sessile glands and setose hairs.
Distribution in Thailand
Peninsular Malaysia and Borneo.
In shade at low altitudes (but in Peninsular Malaysia to 1000 m so likely to be found higher in Thailand).
Proposed IUCN Conservation Assessment
Least Concern (LC). This species is widespread and not under any known threat.
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