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).