Cyclosorus falcilobus (Hook.) Panigrahi

Family

Thelypteridaceae

Nomenclature

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.

Description

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

Xieng Khouang.

Wider Distribution

India (Assam), Upper Burma, SW & S China, and Vietnam.

Ecology

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).

Habit

Habit

Habit

Habit

Transverse section through rhizome

Transverse section through rhizome

Crozier

Crozier

Pinnae

Pinnae

Apex of frond

Apex of frond

Upper surface of rachis and pinnae

Upper surface of rachis and pinnae

Full sized pinnae and suddenly reduced basal pinnae beneath

Full sized pinnae and suddenly reduced basal pinnae beneath

Reduced pinnae on stipe

Reduced pinnae on stipe

Lower surface of rachis with aerophores and bases of pinnae

Lower surface of rachis with aerophores and bases of pinnae

Base of pinnae

Base of pinnae

Lower surface of frond

Lower surface of frond

Lower surface of pinna

Lower surface of pinna

Upper surface of fertile pinna

Upper surface of fertile pinna

Sori

Sori

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 16 November 2016.