Diplazium prescottianum (Wall. ex Hook.) T.Moore

Family

Athyriaceae

Nomenclature

Diplazium prescottianum (Wall. ex Hook.) T.Moore, Index Filic.: 156, 334. 1859; Holttum, Gard. Bull. Straits Settlem. 11: 94. 1940; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 103. 1967; Tagawa & K.Iwats., Acta Phytotax. Geobot. 23: 56. 1968; Tagawa & K.Iwats., Fl. Thailand 3: 457. 1988; Boonkerd & Pollawatn, Pterid. Thailand: 194. 2000. – Asplenium prescottianum Wall. ex Hook., Sp. Fil. 3: 251. 1860. – Diplazium sylvaticum var. prescottianum (Wall. ex Hook.) Bedd., Handb. Ferns Brit. India: 178. 1883. – Athyrium prescottianum (Wall. ex Hook.) Holttum, Rev. Fl. Malaya ed. 1, 2: 557. 1955 [‘1954’].

Description

Rhizome short, erect, bearing thick black roots; scales dark brown, about 15 by 1 mm, entire. Stipes about 80 cm long, stramineous with dark brownish base, glabrous. Frond oblong, about 50 by 20 cm, pinnate; lateral pinnae stalked, ascending, falcate, caudate-attenuate at apex, rounded to moderately auricled at acroscopic and cuneate at basiscopic bases, up to 15 by 1.7 cm, shallowly crenate, terminal pinna not distinct with deeply lobed base, the lower ones like the upper lateral pinnae; thin chartaceous, dark green with paler lower surface, glabrous; costa raised below, veins twice or thrice forked, all free, glabrous. Sori elongate along basal anterior veinlets or rarely along basal posterior ones; indusia thin but firm, persistent .

Distribution in Thailand

SOUTH-EASTERN: Trat; PENINSULAR: Nakhon Si Thammarat, Yala.

Wider Distribution

Peninsular Malaysia.

Ecology

On humus-rich mountain slopes in dense evergreen forests at medium altitudes.

Proposed IUCN Conservation Assessment

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

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