Family

Athyriaceae

Nomenclature

Diplazium silvaticum (Bory) Sw., Syn. Fil.: 92. 1806; Bedd., Handb. Ferns Brit. India.: 177. 1883; Christ, Bot. Tidsskr. 24: 108. 1901; C.Chr., Bot. Tidsskr. 32: 346. 1916; Holttum, Gard. Bull. Straits Settlem. 11: 99. 1940; Tagawa & K.Iwats., SouthE. Asian Stud. 3(3): 87. 1965; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 104. 1967; Tagawa & K.Iwats., Acta Phytotax. Geobot. 23: 56. 1968; Tagawa & K.Iwats., Fl. Thailand 3: 459. 1988; Boonkerd & Pollawatn, Pterid. Thailand: 195. 2000. – Callipteris silvaticum Bory, Voy. Iles Afrique 1: 282. 1804.

Athyrium pinnatum (Blanco) Copel., Philipp. J. Sci., Sect. C, Botany 3: 297. 1908; Holttum, Rev. Fl. Malaya ed. 1, 2: 560, f. 331. 1955 [‘1954’]; Holttum, Dansk Bot. Ark. 20: 32. 1965.

Description

Description adapted from Holttum, Rev. Fl. Malaya ed. 1, 2: 560, f. 331. 1955 [‘1954’].
Rhizome short, erect. Scales on young fronds and bases of stipes very dark, to about 10 mm long and 1.5 mm wide, closely and distinctly toothed, teeth often forked. Stipes to about 40 cm long. Frond simply pinnate, to about 50 by 20 cm, pinnae numerous, lower stalked to about 5 mm, upper sessile; bulbil sometimes present on rachis near apex; lowest pinnae with upper base subtruncate, lower base cuneate; upper pinnae with base broadly cuneate to truncate, more or less auricled above but not below; pinnae to about 12 cm long and 3–4.5 cm wide (commonly less), apex acuminate, edges lobed to about 1/4 distance to costa, texture thin; lobes oblique, about 5 mm wide, veins in pinnate groups with 3–4 pairs of lateral veins; sori from near base of veins 3/4 or more towards edge, sorus on acroscopic basal vein diplazioid, sometimes sorus on next acroscopic vein also, other sori simple .

Distribution in Thailand

NORTHERN: Phitsanulok; NORTH EASTERN: Loei; SOUTH-EASTERN: Chanthaburi, Trat; PENINSULAR: Chumphon, Surat Thani, Phangnga, Krabi, Nakhon Si Thammarat, Trang, Satun, Yala.

Wider Distribution

Mauritius, India, Burma, Peninsular Malaysia, Borneo, Java, and Philippines.

Ecology

On mountain slopes usually in moist places in dense evergreen forests at low to medium elevations below 1200 m alt.

Similar species

Diplazium crenatoserratum (Blume) T.Moore

Diplazium mettenianum (Miq.) C.Chr.

Proposed IUCN Conservation Assessment

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