The following species, described in Dendrobium but belonging to Cadetia, have not yet been formally transferred: Cadetia citrina (Ridley) Schuiteman, comb. nov. Dendrobium citrinum Ridley, Trans. Linn. Soc. London, ser. 2, 9 (1916) 175. Dendrobium fluctuosum J.J. Sm., Bot. Jahrb. 66 (1934) 186, syn. nov. — Cadetia fluctuosa (J.J. Sm.) P.F. Hunt, Kew Bull. 26 (1971) 179, syn. nov. Note – Cadetia citrina is a distinctive, large-flowered species, related to C. cyclopensis (J.J. Sm.) Schltr., but with relatively much shorter, elliptic petals and broadly rounded side-lobes to the lip. More than half a dozen collections of C. citrina were studied, including the types of Dendrobium fluctuosum and D. citrinum. They are quite constant morphologically, differing only somewhat in the size of the flowers. The description of Dendrobium citrinum is of a relatively small-flowered specimen, that of D. fluctuosum of a large-flowered one. Most of the specimens seen by me were intermediate in size. This very pretty species is widely distributed in New Guinea, from the Cenderawasih [Vogelkop] Peninsula in Irian Jaya to the Southern Highlands Province of Papua New Guinea, between 1100 and 2000 m asl. Cadetia doormanii (J.J. Sm.) Schuiteman, comb. nov. Dendrobium doormanii J.J. Sm., Nova Guinea 14 (1929) 397.