Dendrobium pumilio Schltr., Repert. Spec. Nov. Regni Veg. Beih. 1 (1912) 527; 21 (1923) t. 178, fig. 666 (= subsp. masarangense).
Type: Schlechter 16545 (B, lost; AMES, BO, E, G, K, L, NSW); 17998 (B, lost; iso NSW); 19165 (B, lost); 20267 (B, lost).
Pedilonum pumilio (Schltr.) Rauschert, Feddes Repert. 94 (1983) 462.
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Dendrobium frigidum Schltr., Repert. Spec. Nov. Regni Veg. Beih. 1 (1912) 534; 21 (1923) t. 181, fig. 676 (= subsp. theionanthum var. theionanthum).
Type: Schlechter 18723 (holo B, lost, iso NSW).
Pedilonum frigidum (Schltr.) Rauschert, Feddes Repert. 94 (1983) 459.
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Dendrobium theionanthum Schltr., Repert. Spec. Nov. Regni Veg. Beih. 1 (1912) 528; 21 (1923) t. 178, fig. 667 (= subsp. theionanthum var. theionanthum).
Type: Schlechter 19630 (holo B, lost, iso AMES, BO, E, G, K, L, NSW).
Pedilonum theionanthum (Schltr.) Rauschert, Feddes Repert. 94 (1983) 464.
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Dendrobium caespitificum Ridl., Trans. Linn. Soc. London, Bot. 9 (1916) 171 (= subsp. theionanthum var. theionanthum).
Type: Kloss s.n. (Camp 6c, 5500 ft.) (holo BM).
Pedilonum caespitificum (Ridl.) Rauschert, Feddes Repert. 94 (1983) 458.
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Dendrobium chlorinum Ridl., Trans. Linn. Soc. London, Bot. 9 (1916) 172 (= subsp. theionanthum var. chlorinum).
Type: Kloss s.n. (Camp 6b, 3900 ft.); (Camp 6c, 5500 ft) (syn BM, iso K).
Pedilonum chlorinum (Ridl.) Rauschert, Feddes Repert. 94 (1983) 458.
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Dendrobium gemma Schltr., Bot. Jahrb. Syst. 58 (1923) 108 (= subsp. theionanthum var. theionanthum).
Type: Ledermann 1715 (holo B, lost).
Pedilonum gemma (Schltr.) Rauschert, Feddes Repert. 94 (1983) 459.
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Dendrobium monogrammoides J.J.Sm., Nova Guinea 14 (1929) 431, pl. 68, 80 (= subsp. theionanthum var. theionanthum).
[Type: Lam 1438 (holo L, iso BO); para: Lam 1581.
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Dendrobium pseudofrigidum J.J.Sm., Nova Guinea 14 (1929) 426, pl. 67, 76 (= subsp. theionanthum var. theionanthum).
Type: Pulle 886 (holo BO?, iso K, L); para Doorman 10; Lam 1776; 1883; 1950; 1951