Diplazium simplicivenium Holttum
Diplazium simplicivenium Holttum, Gard. Bull. Straits Settlem. 11: 100. 1940; Tagawa & K.Iwats., SouthE. Asian Stud. 3(3): 88. 1965; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 106. 1967; Tagawa & K.Iwats., Fl. Thailand 3: 464. 1988; Boonkerd & Pollawatn, Pterid. Thailand: 195. 2000. – Athyrium simplicivenium (Holttum) Holttum, Rev. Fl. Malaya ed. 1, 2: 573, f. 340. 1955 [‘1954’]; Holttum, Dansk Bot. Ark. 20: 32. 1961.
Rhizome massive, erect, bearing a tuft of gigantic fronds; scales about 20 by 2 mm, brown, black-margined, toothed. Stipes up to 1 m long, about 2 cm diam. near base. Frond about 1.4 by 1 m, bipinnate; lower pinnae about 60 by 25 cm, narrowly oblong with acute apex; larger pinnules shortly stalked to sessile, narrowly subtriangular, gradually narrowing towards a acuminate apex, smaller ones rounded to acute, broadly cuneate to subtruncate or subcordate at base, usually shallowly lobed, up to 12 by 2.5 cm; lobes subquadrangular, obtuse at apex, subentire, 5–8 mm in breadth; softly papyraceous, green, shiny above; veins pinnate with 4–6 pairs of simple veinlets; veinlets hardly reaching the margin of lobes, basal anterior ones stopping far below the sinus. Sori about 8 mm long.
Distribution in Thailand
SOUTH-WESTERN: Uthai Thani, Kanchanaburi, Phetchaburi; SOUTH-EASTERN: Trat; PENINSULAR: Surat Thani, Phangnga, Nakhon Si Thammarat, Trang, Satun, Yala.
Peninsular Malaysia and probably also in Borneo.
On moist mountain slopes in dense evergreen forests at medium elevations at 400–1500 m alt.
Diplazium dilatatum Blume
Proposed IUCN Conservation Assessment
Least Concern (LC). This species is widespread and not under any known threat.
Lower surface of pinna
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