Dryopteris neoassamensis Ching
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.
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.
S China (Guangdong).
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).
Apex of rhizome
Transverse section through rhizome
Stipe bases and scales
Upper surface of frond
Junction of basal pinnae
Upper surface of frond showing poisition of sori raised above
Lower surface of frond and sori
Sori showing large indusia
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