Diplazium polypodioides Blume




Diplazium polypodioides Blume, Enum. Pl. Javae.: 194. 1828; Bedd., Handb. Ferns Brit. India: 184, f. 89. 1883; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 266. 1940; Holttum, Gard. Bull. Straits Settlem. 11: 93. 1940; Tagawa & K.Iwats., SouthE. Asian Stud. 3(3): 88. 1965; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 105. 1967; Tagawa & K.Iwats., Fl. Thailand 3: 465. 1988; Boonkerd & Pollawatn, Pterid. Thailand: 194. 2000.

Diplazium asperum Blume, Enum. Pl. Javae.: 195. 1828; Bedd., Handb. Ferns Brit. India: 184, f. 88. 1883; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 265. 1940. – Athyrium asperum (Blume) Milde, Bot. Zeit. 1870: 353. 1870; Holttum, Rev. Fl. Malaya ed. 1, 2: 571, f. 320. 1955 [‘1954’].


Rhizome massive, erect; scales narrow, about 30 by 1.8 mm, medium brown, black-margined, toothed. Stipes stout, about 1.5 cm diam. near base, up to 1 m long, densely scaly near base, surface prickly due to scars of fallen scales. Frond usually more than 1 m long, 70 cm wide, bipinnate-tripinnatifid; lower pinnae about 50 by 20 cm, acute at apex; larger pinnules oblong with acuminate apex and subtruncate base, sessile or shortly stalked, up to 10 by 2 cm, lobed nearly to costule; lobes oblong to subquadrangular, oblique, rounded to obtuse at apex, sharply serrate, about 4 mm broad, up to 1 cm long; papyraceous, deep green, paler below; veins pinnate, veinlets 5–9 pairs, mostly forked. Sori usually close to costules, less than 2 mm long; indusia thin.

Distribution in Thailand

NORTHERN: Chiang Mai, Chiang Rai, Phrae, Tak, Phitsanulok; SOUTH-EASTERN: Chanthaburi; PENINSULAR: Ranong, Surat Thani, Nakhon Si Thammarat.

Distribution in Laos

[entre Banna-punh et Ta-do]

Wider Distribution

Sri Lanka, S India, Himalaya, Indochina, throughout Malesia, north to Taiwan.


On humus-rich mountain slopes with high moisture at various elevations throughout the country, usually at edge of forests or in clearings, not in deep shade.

Proposed IUCN Conservation Assessment

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

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