Leptochilus hemionitideus (C.Presl) Noot.

Family

Polypodiaceae

Nomenclature

Leptochilus hemionitideus (C.Presl) Noot., Blumea 42: 285. 1997. – Colysis hemionitidea C.Presl, Epimel. Bot.: 147. 1851 [‘1849’]; Ching, Bull. Fan Mem. Inst. Biol. 4: 320. 1933; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 494. 1941; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 54. 1967; Tagawa & K.Iwats., Fl. Thailand 3: 536. 1989; Boonkerd & Pollawatn, Pterid. Thailand: 264. 2000. – Pleopeltis hemionitidea (C.Presl) T.Moore, Index Fil.: 346. 1862; Bedd., Handb. Ferns Brit. India: 358, f. 202. 1883. – Microsorum hemionitideum (C.Presl) Copel., Univ. Calif. Publ. Bot. 16: 112. 1929. – Leptochilus decurrens Blume subsp. hemionitideus (C.Presl) Fraser-Jenk., Taxon. Revis. Indian Subcontinental Pteridophytes 63. 2008. – Type: Wallich 284, Nepal, 1822 (K, US)

Colysis sp.: Holttum, Dansk Bot. Ark. 20: 20. 1961.

Description

Rhizome creeping, 2–4 mm diam., scaly throughout; scales pseudopeltate, oblong- subtriangular, gradually narrowing from base towards long-acuminate apex, 2–4 by 0.7–1.2 mm, finely clathrate with larger longitudinal cells, slightly toothed or not at margin. Stipes up to 3(–7) cm long. Laminae simple, oblong to oblong-lanceolate, broadest at middle portion of laminae, gradually narrowing towards acute apex, roundly narrowing and then broadly decurrent downwards forming broad wings of stipes, (28–)35–85 by 3–8.5 cm; lateral main veins raised, about 8 mm apart at broadest portion, the veins distinct, forming areoles with included veinlets; herbaceous, dark green, brownish in dried condition. Sori round to shortly elongate, arranged in one usually regular row between adjacent main veins. Spores monolete .

Distribution in Thailand

NORTHERN: Mae Hong Son, Chiang Mai, Chiang Rai, Nan, Phrae, Tak, Phitsanulok; SOUTH-WESTERN: Phetchaburi; SOUTH-EASTERN: Chanthaburi.

Wider Distribution

N India, Nepal, Bhutan, S China, Taiwan and the Ryukyus.

Ecology

On wet rocks usually in stream-beds in dense forests at 800–1500 m alt.

Similar species

Microsorum heterocarpum (Blume) Ching

Microsorum zippelii (Blume) Ching

Proposed IUCN Conservation Assessment

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

Voucher specimens - Thailand

Middleton et al. 5044, Chiang Mai, Doi Pha Hom Pok National Park (E); La-Ongsri & Romkham 1451, Nan (QBG).

Habit

Habit

Habit

Habit

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.