Diplazium heterophlebium (Mett. ex Baker) Diels
Diplazium heterophlebium (Mett. ex Baker) Diels in Nat. Pflanzenfam. 1(4): 228. 1899; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 268. 1940; Tagawa & K.Iwats., Acta Phytotax. Geobot. 24: 63. 1969; Tagawa & K.Iwats., Fl. Thailand 3: 451. 1988; Boonkerd & Pollawatn, Pterid. Thailand: 192. 2000. – Asplenium heterophlebium Mett. ex Baker in Hook. & Baker, Syn. Fil.: 243. 1867. – Anisogonium heterophlebium (Mett. ex Baker) Bedd., Ferns Brit. India: t. 329. 1869; Bedd., Handb. Ferns Brit. India: 191, f. 93. 1883. – Athyrium heterophlebium (Mett. ex Baker) Copel., Philipp. J. Sci. 38: 142. 1929; Holttum, Rev. Fl. Malaya ed. 1, 2: 549. 1955 [‘1954’].
Rhizome short, ascending, bearing fleshy green roots; scales ovate with tailed apex, up to 7 by 2 mm, pale brown, membranous, entire. Stipes about 20 cm long, stramineous to darker, narrowly scaly. Frond oblong, pinnate or pinnatifid above, up to 30 by 20 cm; lower 1–3 lateral pinnae free, sessile, oblong, caudate at apex, subtruncate to cordate at base, up to 10 by 3.5 cm, subentire or undulate at margin; upper part of frond lobed less deeply upwards, the lower lobes like the free pinnae; herbaceous, minutely hairy on surfaces; rachis minutely scaly as well as hairy, dark; veins pinnately branching, forming areoles without included veinlets. Sori elongate along veinlets, sometimes on both sides of veinlets; indusia completely covering the sori , not so thin, brown at maturity.
Distribution in Thailand
NORTHERN: Chiang Mai.
E Himalaya to Yunnan, south to N Vietnam and Peninsular Malaysia, north to southern edge of Japan (Isl. Yakushima).
Along streams in moist hill evergreen forest at about 1750 m alt.
Proposed IUCN Conservation Assessment
Least Concern (LC). This species is widespread and not under any known threat.
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