Cyclosorus falcilobus (Hook.) Panigrahi
Cyclosorus falcilobus (Hook.) Panigrahi, Res. J. Pl. Environ. 9: 66. 1993. – Lastrea falciloba Hook., J. Bot. 9: 337. 1857. – Lastrea calcarata var. falciloba (Hook.) C.B.Clarke, Trans. Linn. Soc. London, Bot. 1: 516. 1880; Bedd., Handb. Ferns Brit. India: 237. 1883. – Thelypteris falciloba (Hook.) Ching, Bull. Fan Mem. Inst. Biol. 6: 298. 1936; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 358. 1941; Tagawa & K.Iwats., Acta Phytotax. Geobot. 23: 49. 1968; Tagawa & K.Iwats., Fl. Thailand 3: 422. 1988; Boonkerd & Pollawatn, Pterid. Thailand: 230. 2000.
Thelypteris esquirolii auct. non (Christ) Ching: Mitsuta, Acta Phytotax. Geobot. 36: 148. 1985.
Rhizome short, erect; scales up to 4 by 2 mm, pale brown, thin, hairy at margin. Stipes up to 30 cm long, with reduced pinnae nearly to base. Laminae oblong-lanceolate, acute at apex, up to 44.5 by 21.5 cm, 17–28 pairs of full sized primary pinnae; lower pinnae reduced to mere auricles, middle pinnae linear-lanceolate, gradually narrowing towards long-acuminate apex, cuneate at sessile base, 6.5–17 by 1–1.5 cm, deeply lobed nearly towards costa; segments falcate, oblique, forming angle of 35°–45° between costa and costule, acute at apex, entire and often involute; softly chartaceous, green, pubescent on undersurface; veins pinnate, veinlets simple, hairy, basal anterior ones running to callous-membrane in sinus between segments. Sori round, medial; indusia persistent, glandular .
Distribution in Thailand
NORTHERN: Mae Hong Son, Chiang Mai, Chiang Rai, Phitsanulok; NORTH-EASTERN: Phetchabun.
Distribution in Laos
India (Assam), Upper Burma, SW & S China, and Vietnam.
Terrestrial near streams in shade at medium altitudes.
Proposed IUCN Conservation Assessment
Least Concern (LC). This species is widespread and not under any known threat.
Voucher specimens - Thailand
Middleton et al. 4968, Mae Hong Son, Mok Cham Pae (E); Hansen et al. 10956, Chiang Mai, Huey Na (K); Middleton et al. 5106, Phitsanulok, Rom Klao (E); Boonkerd 1707, Phetchabun, Nam Nao National Park (K).
Transverse section through rhizome
Apex of frond
Upper surface of rachis and pinnae
Full sized pinnae and suddenly reduced basal pinnae beneath
Reduced pinnae on stipe
Lower surface of rachis with aerophores and bases of pinnae
Base of pinnae
Lower surface of frond
Lower surface of pinna
Upper surface of fertile pinna
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