Dryopteris subtriangularis (C.Hope) C.Chr.
Dryopteris subtriangularis (C.Hope) C.Chr., Index Filic.: 296. 1905; Ching, Bull. Fan Mem. Inst. Biol. 8: 96. 1938; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 315, f. 35.1 & 35.2. 1941; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 96. 1967; Tagawa & K.Iwats., Fl. Thailand 3: 355. 1988; Boonkerd & Pollawatn, Pterid. Thailand: 205. 2000. – Nephrodium subtriangulare C.Hope, J. Bot. 28: 327. 1890. – Type: Mann s.n., Sept. 1888, India, Khasia (syntype P); Mann s.n., March 1890, India, Jaintea Hills (syntype P).
Dryopteris chapensis auct. non C.Chr. & Ching: Holttum, Dansk Bot. Ark. 20: 30. 1961, p.p.
Rhizome short, erect, densely scaly at apex; scales linear, entire, 7–11 by 0.6–0.7 mm, nearly black. Stipes dark stramineous to pale brown, densely scaly at base, sparsely upwards, upper scales smaller, 13.5–36.5 cm long. Laminae oblong-ovate with acuminate apex, 18–35 by 12.5–24 cm, bipinnate to tripinnatifid at base; rachis like the upper part of stipe, with linear scales, grooved above; pinnae subopposite, 10–18 pairs of lateral pinnae of which 2–6 pairs are pinnate and the rest pinnatifid or simple, shortly stalked, narrowly subtriangular, caudate-acuminate at apex, subtruncate to broadly cuneate at base, 7–17.5 by 2.8–6 cm; pinna-rachis bullate-scaly, slightly ascending; pinnules oblong to oblong-subdeltoid, rounded to obtuse at apex, broadly cuneate and auricled on both sides at base, up to 2.5 by 1 cm, lobed almost to the base in larger ones, light green in living condition, drying brown; softly papyraceous, rather thin but coarse. Sori dorsal on veinlets, medial; indusia about 0.7 mm diam., fugacious .
Distribution in Thailand
NORTHERN: Chiang Mai; NORTH-EASTERN: Loei; CENTRAL: Nakhon Nayok.
NE India, S China and N Vietnam.
On rather dry sandy slopes in mountain forests at 1000–1200 m alt.
Proposed IUCN Conservation Assessment
Least Concern (LC). This species is widespread and not under any known threat.
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.