Diplazium accedens Blume

Family

Athyriaceae

Nomenclature

Diplazium accedens Blume, Enum. Pl. Javae: 192. 1828; Holttum, Gard. Bull. Straits Settlem. 11: 81. 1940; Tagawa & K.Iwats., Acta Phytotax. Geobot. 23: 56. 1968; Tagawa & K.Iwats., Fl. Thailand 3: 451. 1988; Boonkerd & Pollawatn, Pterid. Thailand: 190. 2000. – Athyrium accedens (Blume) Milde, Bot. Zeit. 1870: 353. 1870; Holttum, Rev. Fl. Malaya ed. 1, 2: 558, f. 329. 1955 [‘1954’].

Description

Rhizome massive, erect; scales linear, about 15 by 1 mm, brown with blackish-brown thickened marginal strand bearing sharp teeth. Stipes about 50 cm long, up to 1.5 cm diam. near scaly base, the scars of fallen-off scales sometimes spiny, stramineous. Frond pinnate, 5–15 pairs of lateral pinnae free, stalked in lower ones, sessile to decurrent in upper ones, basal pinnae the largest, oblong with acuminate apex, rather suddenly broadly cuneate to subtruncate at base, about 30 by 8 cm, undulate at margin; uppermost part of frond deltoid, deeply lobed in lower portion, up to 15 by 10 cm; papyraceous, glabrous or minutely scaly, scabrous underneath; rachis grooved on upper surface, gemmiferous; costa raised below, grooved with distinct ridges on upper surface; veins pinnate, veinlets uniting with those of the opposite group, forming continuously, united veinlets (seemingly goniopteroid venation), the areoles like that of Diplazium heterophlebium (Mett. ex Baker) Diels in outer part. Sori along veinlets, often forming areoles following the venation; indusia opening outwards.

Distribution in Thailand

PENINSULAR: Ranong, Yala.

Wider Distribution

Throughout Malesia.

Ecology

On moist ground by streams in evergreen jungle at low altitude.

Proposed IUCN Conservation Assessment

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

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