Haplopteris winitii (Tagawa & K.Iwats.) S.Linds., Edinburgh J. Bot. 66(2): 357. 2009. – Antrophyum winitii Tagawa & K.Iwats., Acta Phytotax. Geobot. 23: 176, f. 13. 1969; Tagawa & K.Iwats., Fl. Thailand 3: 218, f. 17.1. 1985; Boonkerd & Pollawatn, Pterid. Thailand: 134. 2000.
Rhizome short, erect or ascending, bearing a tuft of fronds, densely scaly; scales gradually narrowing from base towards hair-like apex, 2–3 by about 0.3 mm, distinctly clathrate with dark brownish to nearly black internal cell-walls, the margin appearing toothed due to thickening of internal cell-walls. Laminae linear, up to 3 cm long, 2 mm broad, broadest at ¼ from apex, gradually narrowing towards base, the stipe not distinct, apex forked, or rarely forked twice, forming acute teeth usually unequal in size, sinus triangular, about 0.5 mm in depth; leathery, glabrous; costa not distinct, veins forming areoles. Sori linear, in longitudinal furrows, usually in one row near the margin on both sides of fronds; paraphyses many, ribbon-like, dark red.
NORTHERN: Chiang Mai, Chiang Rai, Lampang.
Gregarious on bark of trees in semi-evergreen forest at 520 m alt.
Data Deficient (DD). This species is currently only known from Thailand has only rarely been collected. The current EOO is less than 20,000 km2 but any current or potential threats to the populations are unknown.
Namnuan 17, Chiang Mai (CMU); Maxwell 97-421, Lampang (CMU).