Dryopteris neoassamensis Ching

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).

Frond

Frond

Habit

Habit

Apex of rhizome

Apex of rhizome

Transverse section through rhizome

Transverse section through rhizome

Crozier

Crozier

Stipe bases and scales

Stipe bases and scales

Stipe

Stipe

Upper surface of frond

Upper surface of frond

Junction of basal pinnae

Junction of basal pinnae

Upper surface of frond showing poisition of sori raised above

Upper surface of frond showing poisition of sori raised above

Lower surface of frond and sori

Lower surface of frond and sori

Sori showing large indusia

Sori showing large indusia

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