Cyclosorus subelatus (Baker) Ching

Family

Thelypteridaceae

Nomenclature

Cyclosorus subelatus (Baker) Ching, Bull. Fan Mem. Inst. Biol. 8: 224. 1938. – Nephrodium subelatum Baker, Bull. Misc. Inform. Kew 1906: 11. 1906. – Thelypteris subelata (Baker) K.Iwats., J. Jap. Bot. 38: 315. 1963; Tagawa & K.Iwats., SouthE. Asian Stud. 3(3): 80. 1965; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 66. 1967; Tagawa & K.Iwats., Fl. Thailand 3: 429. 1988; Newman et al., Checkl. Vasc. Pl. Lao PDR: 33. 2007. – Christella subelata (Baker) Holttum, Kew Bull. 31: 331. 1976; Boonkerd & Pollawatn, Pterid. Thailand: 222. 2000. – Type: Henry 11809a, Yunnan, Szemao, 1200 m (holotype K; isotype E).

Description

Rhizome creeping, about 6 mm diam.; scales narrow, up to 5 by 1 mm, dark brown hirsute. Stipes 14–50 cm long, hairy throughout, bearing reduced lower pinnae on upper portion. Laminae oblong, acuminate at apex with long terminal pinna, 24–80 by 19–40 cm; lower lateral pinnae shortened to mere auricles, middle pinnae shortly stalked or subsessile, linear-lanceolate, gradually narrowing towards acuminate apex, round to broadly cuneate at base, 7.5–25 by 1.9–2.7(–3.5) cm, lobed more than 1/3 way to costa; segments oblong to subrectangular, oblique, rounded at apex; papyraceous, dark to greyish-green, pale below, subglabrous to sparsely pubescent, often verrucose; 2 or 3 pairs of lower veinlets truly anastomosing below callous-sinus. Sori medial; indusia round, persistent, shortly hairy or densely long-hairy .

Distribution in Thailand

NORTHERN: Mae Hong Son, Chiang Mai, Chiang Rai, Lamphun, Lampang, Phrae, Tak, Phitsanulok; NORTH-EASTERN: Loei, Nong Khai; SOUTH-WESTERN: Kanchanaburi; SOUTH-EASTERN: Chon Buri, Chanthaburi.

Distribution in Laos

Luang Phrabang.

Wider Distribution

SW China and Upper Burma.

Ecology

On mountain slopes in open places to somewhat deep shade at medium altitudes.

Proposed IUCN Conservation Assessment

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

Notes

This fern is common in northern Thailand and rather variable in size and form of fronds and in pubescence. Chanthaburi plants are distinct in having densely long-hairy indusia .

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