Family

Polypodiaceae

Nomenclature

Gymnogrammitis dareiformis (Hook.) Ching ex Tardieu & C.Chr., Fl. Indo-Chine 7(2): 117, f. 14.1 & 14.2. 1939; Ching, Fl. Reipubl. Popularis Sin. 2: 284, pl. 21, f. 3–6. 1959; Holttum, Dansk Bot. Ark. 20: 25. 1961; Tagawa & K.Iwats., Fl. Thailand 3: 616. 1989; Boonkerd & Pollawatn, Pterid. Thailand: 235. 2000. – Polypodium dareiforme Hook., Sec. Cent. Ferns: t. 24. 1860; Bedd., Handb. Ferns Brit. India: 316, f. 169. 1883. – Leucostegia dareiformis (Hook.) Bedd., Suppl. Ferns S. India: 4. 1876; C.Chr., Contr. U.S. Natl. Herb. 26: 332. 1931. – Araiostegia dareiformis (Hook.) Copel., Univ. Calif. Publ. Bot. 12: 398. 1931; Tagawa & K.Iwats., Fl. Thailand 3: 151, f. 11.1. 1985; Newman et al., Checkl. Vasc. Pl. Lao PDR: 26. 2007.

Description

Rhizome long creeping, about 5 mm diam., densely scaly; scales gradually narrowing from base towards tailed apex, 4–5 mm long, up to 1 mm broad, pale brown or brown in age with dark brown central portion, thin and ferrugineous. Stipes stramineous to brown, scaly at base, glabrous upwards. Laminae oblong, acute to acuminate at apex, tripinnate to quadripinnatifid, up to 25 by 15 cm; costae like the upper part of pinnae, winged in upper portion; pinnae about 10 pairs, alternate, oblong-subdeltoid, gradually narrowing towards acute apex, falcate, up to 10 by 5 cm, distinctly stalked; pinnules subdeltoid on short stalks, acute at apex, broadly cuneate at base, up to 3 by 2 cm; ultimate segments simple or forked, one-nerved, entire, acute at apex; herbaceous to softly papyraceous, deep green, glabrous. Sori dorsal on veinlets, one for each segment, exindusiate .

Distribution in Thailand

NORTHERN: Chiang Mai, Phitsanulok; NORTH-EASTERN: Loei.

Distribution in Laos

Luang Phrabang.

Wider Distribution

Himalayas, SW China, Hainan and Vietnam.

Ecology

Epiphytic on mossy tree trunks or on wet mossy rocks in gloomy dense forests at altitude above 1200 m.

Proposed IUCN Conservation Assessment

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

Voucher specimens - Thailand

Middleton et al. 4501 & 4903, Chiang Mai, Doi Inthanon National Park (E); Middleton et al. 5142, Loei, Phu Luang Wildlife Sanctuary (E).