Diplopterygium norrisii (Mett.) Nakai
Diplopterygium norrisii (Mett.) Nakai, Bull. Natl. Sci. Mus. 29: 54. 1950. – Gleichenia norrisii Mett., Linnaea 36: 165. 1869; Bedd., Handb. Ferns Brit. India: 2. 1883; Holttum, Rev. Fl. Malaya ed. 1, 2: 67. 1955 [‘1954’]; Holttum, Fl. Males., Ser. II, Pterid. 1: 15, f. 6. 1959; Holttum, Dansk Bot. Ark. 20: 16. 1961; Tagawa & K.Iwats., Fl. Thailand 3: 51. 1979; Boonkerd & Pollawatn, Pterid. Thailand: 33, 81. 2000.
Terrestrial. Rhizome widely creeping, bearing fronds remotely, about 5 mm in diameter, scaly throughout; scales bright brown, lanceolate, long-acuminate at apex, toothed at margin, to 5 mm long, 0.7 mm broad. Fronds of mature plants usually with indefinite growth in length, bearing primary branches in pairs. Stipes thick, to more than 1 m long, stramineous to pale green, scaly at base with the scales like those on rhizome, sparsely scaly upwards with scales like those on the main axes; rachis scales oblong-lanceolate, up to 5 mm long, 0.5 mm broad, concolorously dark brown, hairy; pinnae a few in opposite pairs, bipinnatifid, oblong-lanceolate, acuminate at apex, to 150 cm long, 25–40 cm wide; leaflets up to 20 cm long, 3 cm wide, shortly stalked, about 4 cm apart, all reflexed, basal leaflets not stipuliform, or with broad blunt lobes; scales on resting buds 2–3 mm long, narrow, brown, with short oblique concolourous setae at margin; lobes narrowly oblong, patent, round to moderately acute at apex, larger ones about 1.5 mm long, 5 mm broad, separated by sinus less than 1 mm in width; veinlets free, once or twice forked, distinct on both surfaces, dark brownish stellate hairs often present on lower surface of veins and laminae. Sori exindusiate, dorsal on acroscopic branch of veinlets, round .
Distribution in Thailand
CENTRAL: Nakhon Nayok; PENINSULAR: Nakhon Si Thammarat.
Peninsular Malaysia, Sumatra and N Borneo.
Forming thicket on mountain slopes along streams in or at edge of dense forest at about 1100 m alt.
Proposed IUCN Conservation Assessment
Least Concern (LC). This species is widespread and not under any known threat.
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