Diplazium subintegrum Holttum
Diplazium subintegrum Holttum, Gard. Bull. Straits Settlem. 9: 1.25. 1937; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 103. 1967; Tagawa & K.Iwats., Fl. Thailand 3: 458. 1988; Boonkerd & Pollawatn, Pterid. Thailand: 196. 2000. – Athyrium subintegrum (Holttum) Holttum, Rev. Fl. Malaya ed. 1, 2: 557, f. 328. 1955 [‘1954’].
Rhizome short, erect, bearing fronds in a tuft; scales dark brown, about 8 by 1.5 mm, entire. Stipes up to 50 cm long, stramineous, dark near base. Laminae oblong, about the same length as stipe, as broad as long, imparipinnate; lateral pinnae about 10 pairs, lower ones stalked, narrowly lanceolate, caudate-attenuate at apex, rounded at base, very shallowly crenate with toothed margin, up to 20 by 2.5 cm; terminal pinna up to 20 by 3 cm at broadest lobed basal portion or rarely larger, cuneate at base; softly chartaceous, glabrous; costa raised below, glabrous; veins pinnate, all free. Sori usually on basal anterior veinlets, often also on basal posterior ones, usually diplazioid; indusia pale brown, thin but firm, persistent .
Distribution in Thailand
NORTHERN: Phitsanulok; CENTRAL: Nakhon Nayok; SOUTH-EASTERN: Trat.
On rather dry ground near rivers in light shade at medium altitudes.
Proposed IUCN Conservation Assessment
Least Concern (LC). This species is widespread and not under any known threat.
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