Family

Dryopteridaceae

Nomenclature

Dryopteris neoassamensis Ching, Bull. Fan Mem. Inst. Biol. 8: 480. 1938; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 96. 1967; Tagawa & K.Iwats., Fl. Thailand 3: 355. 1988; Boonkerd & Pollawatn, Pterid. Thailand: 158, 203. 2000.

Description

Rhizome short, erect, densely scaly at apex; scales dark brown, linear, entire, up to 10 by 1 mm. Stipes dark stramineous or pale brown, densely scaly at base, sparsely minutely scaly upwards, about 40 cm long. Laminae oblong with acuminate apex, bipinnate, 35–50 by 25–30 cm; lateral pinnae 4–6 pairs, 3–8 cm apart, subopposite, patent or ascending, very shortly stalked or subsessile, lanceolate, gradually narrowing towards caudate-acuminate apex, subtruncate or rounded at base, up to 18 by 4 cm, basal pinnules slightly shorter; upper pinnae suddenly shortened to form apical pinna, subtriangular in outline, acuminate at apex; pinna-rachis with dark brown bullate scales; pinnules subquadrangular, oblique or falcate, obtuse at apex, subtruncate at base in larger ones, decurrent into smaller ones, serrate at margin, up to 2 by 0.8 cm; midrib of pinnules underneath and sometimes veins also sparsely hairy with shining brown, short, unicellular hairs, glabrous on laminar surface. Sori dorsal on veinlets, medial or costular; indusia up to 1 mm diam., glabrous, persistent .

Distribution in Thailand

NORTHERN: Chiang Mai; NORTH-EASTERN: Loei; EASTERN: Chaiyaphum; CENTRAL: Nakhon Nayok.

Wider Distribution

S China (Guangdong).

Ecology

On rather dry (in dry season) mountain slopes in mixed or evergreen forests at 1000–1300 m alt.

Proposed IUCN Conservation Assessment

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

Voucher specimens - Thailand

Middleton et al. 5118, Loei, Phu Suan Sai National Park (E).