Diplazium mettenianum (Miq.) C.Chr.
Diplazium mettenianum (Miq.) C.Chr., Index Filic.: 236. 1906; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 253. 1940; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 103. 1967; Tagawa & K.Iwats., Fl. Thailand 3: 460. 1988; Boonkerd & Pollawatn, Pterid. Thailand: 193. 2000. – Asplenium mettenianum Miq., Ann. Mus. Bot. Lugduno-Batavi 3: 174. 1867.
Rhizome creeping, about 4 mm diam.; scales dark brown to black, narrow, up to 6 by 1 mm, toothed at margin. Stipes up to 50 cm long, green to stramineous with dark basal portion, glabrous. Frond pinnate, oblong with acute apex, about 40 by 25 cm; lower pinnae distinctly stalked, up to 14 by 2.3 cm, attenuately acuminate at apex, round to auricled at acroscopic and round to cuneate at basiscopic bases, lobed to 1/3 way to costa; lobes oblique, rounded to obtuse at apex, subentire to serrate, upper pinnae rather suddenly becoming smaller, adnate and gradually decurrent at base;. thinly chartaceous, deep green when living, brown when dry, paler beneath; veins pinnate, veinlets all simple. Sori on all veinlets, not so long except on basal acroscopic ones, sometimes diplazioid; indusia firm, persistent .
Distribution in Thailand
N Vietnam, China, Taiwan to Japan.
On humus-rich slopes in dense forests at about 1100 m alt.
Diplazium crenatoserratum (Blume) T.Moore
Diplazium silvaticum (Bory) Sw.
Proposed IUCN Conservation Assessment
Least Concern (LC). This species is widespread outside of Thailand and not under any known threat.
This is a species of the D. silvaticum group, but distinct in its long creeping rhizome. This is typically a Sino-Japanese species, and Phu Kradueng seems to be, a southernmost locality of this species .
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