Dendrobium keysseri Schltr., Repert. Spec. Nov. Regni Veg. 16 (1919) 217.
Type: Keysser s.n. (III-1913, W. of Sattelberg, 1400-1500 m) (holo B, lost).
Pedilonum keysseri (Schltr.) Rauschert, Feddes Repert. 94 (1983) 460.
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Dendrobium tumidulum Schltr., Bot. Jahrb. Syst. 58 (1923) 110.
Type: Ledermann 11714 (holo B, lost).
Pedilonum tumidulum (Schltr.) Rauschert, Feddes Repert. 94 (1983) 464.
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Dendrobium murkelense J.J.Sm., Bull. Jard. Bot. Buitenzorg, sér. 3, 10 (1928) 149.
Type: Moluccas, Seram Island, summit of Goenoeng Moerkele, 2000-2500 m, 1 vii 1918, Kornasi in herb. Rutten 1493 (holo L).
Pedilonum murkelense (J.J.Sm.) Rauschert, Feddes Repert. 94 (1983) 461.
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Dendrobium palustre L.O.Williams, Bot. Mus. Leafl. 12 (1946) 160.
Type: Clemens 12056 c (holo MSC; iso AMES, fragm.).
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Pedilonum nebularum (Schltr.) Rauschert, Feddes Repert. 94 (1983) 461.