Arachniodes henryi (Christ) Ching

Family

Dryopteridaceae

Nomenclature

Arachniodes henryi (Christ) Ching, Acta Bot. Sin. 10: 258. 1962; Tagawa & K.Iwats., Acta Phytotax. Geobot. 26: 58. 1974; Tagawa & K.Iwats., Fl. Thailand 3: 342, f. 30.7-8. 1988; Boonkerd & Pollawatn, Pterid. Thailand: 199. 2000. Polystichum henryi Christ in Lee., Notul. Syst. 1: 36. 1909. – Dryopteris henryi C.Chr., Contr. U.S. Natl. Herb. 26. 282. 1931. – Rumohra henryi (Christ) Ching, Sinensia 5: 57, t. 10. 1934. – Byrsopteris henryi (Christ) Morton, Amer. Fern J. 50: 154. 1960. Type: Henry 13351 (Isotype in K), China, Yunnan.

Rumohra simulans Ching, Sinensia 5: 54, pl. 8. 1934; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 326. 1941; Holttum, Dansk Bot. Ark. 20: 31. 1961. Arachniodes simulans (Ching) Ching, Acta Bot. Sin. 10: 259. 1962; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 93. 1967. Type: Fang 2742, China, Sichuan.

Description

Terrestrial. Rhizome creeping, up to 8 mm diam., scales dense, linear-subtriangular, up to 7 by 1.5 mm, brown. Stipes stramineous, scaly at base, very sparsely, minutely scaly upwards, up to 50(–75) cm long. Laminae oblong to pentagonal, with caudate-acuminate apex, 4–5-pinnate, up to 83 by 75 cm; rachis glabrescent, grooved; pinnae anadromous, about 10 pairs, the lowest the largest, with large, basal, acroscopic pinnule, middle ones oblong-subtriangular, widest at distinctly stalked base, gradually narrowing towards acuminate apex, up to 38 by 13.5 cm, upper pinnae rather suddenly reduced to form apical part of frond, pinnules oblong-subdeltoid, acute at apex, unequally cuneate at base, stalked, 4–10 by up to 4 cm; secondary pinnules oblong-subdeltoid, moderately acute at apex, unequally cuneate at base, pinnatisect to pinnate, segments oblong, oblique, sessile, serrate at margin, lobed in larger ones; papyraceous, green, glabrous on both surfaces or sparsely hairy on veins underneath. Sori round, terminal or more rarely dorsal on veinlets, medial or close to margin, raised on upper surface; indusia round-reniform, glabrous .

Distribution in Thailand

NORTHERN: Mae Hong Son, Chiang Mai, Chiang Rai, Lamphun, Lampang.

Wider Distribution

SW China (Szechuan, Yunnan, Hupeh), Upper Burma and N Vietnam.

Ecology

On mountain slopes usually in dense evergreen forests at 800-1400 m alt.

Proposed IUCN Conservation Assessment

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

Voucher specimens - Thailand

Middleton et al. 4963, Mae Hong Son, Ban Hua Ha (E).

Habit

Habit

Rhizome

Rhizome

Apex of rhizome

Apex of rhizome

Frond

Frond

Frond from the side

Frond from the side

Upper surface of frond showing the position of the sori beneath

Upper surface of frond showing the position of the sori beneath

Lower surface of frond

Lower surface of frond

Lower surface of frond and sori

Lower surface of frond and 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.