Dryopteris polita Rosenst.
Dryopteris polita Rosenst., Repert. Spec. Nov. Regni Veg. 13: 218. 1914; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 317. 1941; Holttum, Rev. Fl. Malaya ed. 1, 2: 492. 1955 [‘1954’]; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 96. 1967; Tagawa & K.Iwats., Fl. Thailand 3: 353, f. 32.9 & 32.11. 1988; Boonkerd & Pollawatn, Pterid. Thailand: 204. 2000. – Dryopteris chapensis auct. non C.Chr. & Ching: Holttum, Dansk Bot. Ark. 20: 30. 1961, p.p.
Rhizome short, ascending or suberect, scales light brown, entire, up to 18 by 2 mm. Stipes stramineous, scaly at base with the scales similar to those on rhizome, more sparsely scaly upwards with smaller ones up to 50 cm long. Laminae oblong with acuminate apex, bipinnate, up to 35 by 28 cm; 5 or 6 lower lateral pinnae nearly equal in size or slightly smaller upwards, with stalks of 1–2.5 cm long, narrowly subtriangular with acuminate apex, unequally broadly cuneate at base, 10–12 by 5.5 cm, sometimes with a slightly enlarged basal basiscopic pinnule on one or more pinnae; upper pinnae rather suddenly shortened, very shortly stalked, sessile or adnate at base, oblong-subdeltoid with acute apex, shallowly lobed at margin; pinnules oblong-subdeltoid, rounded at apex, round or cuneate at base or acroscopically auricled in larger ones, up to 3 by 1.2 cm, serrate at margin; papyraceous, not very thick or harsh, deep green. Sori dorsal on veinlets, medial or just beyond midway from midrib to margin of pinnule, in one row, indusia minute, round reniform, glabrous, lost before sori mature (commonly and erroneously described as exindusiate ).
Distribution in Thailand
NORTHERN: Chiang Mai, Tak; NORTH-EASTERN: Loei; CENTRAL: Nakhon Nayok; SOUTH-EASTERN: Chanthaburi; PENINSULAR: Ranong, Nakhon Si Thammarat.
Distribution in Cambodia
Indochina, W Malaysia, Sumatra, Borneo, Taiwan, and northwards to southern edge of Japan.
On mountain slopes in not very dense mountain forests at 100–1500 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. 5087, Phitsanulok, Phu Hin Rong Kla National Park (E); Suksathan 4434, Chanthaburi, Khao Soi Dao (E, QBG).
Transverse section through rhizome
Pinna from beneath
Junction of pinnae with rachis
Lower surface of frond with young sori
Young sori (with tiny indusia barely visible)
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