Platanthera angustata (Bl.) Lndl., Gen. et sp. Orch. (1835), 290; etc. Sumatra: Atjeh, Gajolanden, Poetjoek Angasan, bivouac 1 to 2, 2700 m, blang ground, marshy heath, common (C. G. G. J. van Steenis n. 8350, 28 Jan. 1937). G. Leuser, bivouac 4—5, watershed, 2700—2800 m (C. G. G. J. van Steenis n. 8502, 31 Jan. 1937). Same locality, central top, Aloer near bivouac 6, 3250—3300 m, mountain meadow (C. G. G. J. van Steenis n. 8683, 3 Febr. 1937). G. Goh Lemboeh, from bivouac Aer Poetih waterfall to bivouac Halfweg, 1000 m (C. G. G. J. van Steenis n. 8902, 8 Febr. 1937).