Pedilonum brevicaule (Rolfe) Rauschert, Feddes Repert. 94 (1983) 457.
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Dendrobium pentagonum Kraenzl., in Engl., Pflanzenr. IV. 50. II. B. 21 (1910) 128 (= subsp. pentagonum).
Type: East New Guinea, Milne Bay Province, Mt. Dayman, 3000m, iii 1894, Armit s.n. (HBG).
Pedilonum pentagonum (Kraenzl.) Rauschert, Feddes Repert. 94 (1983) 462.
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Dendrobium calcarium J.J.Sm., Bull. Jard. Bot. Buitenzorg, sér. 2, 2 (1911) 13; Nova Guinea 12, 1 (1913) 69, t. 18, fig. 55 (= subsp. calcarium).
Lectotype: (designated by van Royen 1979) West New Guinea, Mt. Goliath, 3250m, February 1911, de Kock IX (BO).
Pedilonum calcarium (J.J.Sm.) Rauschert, Feddes Repert. 94 (1983) 458.
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?Dendrobium saruwagedicum Schltr., Repert. Spec. Nov. Regni Veg. 16 (1919) 217.
Type: Keysser s.n. (X-1912, Saruwaged Mountains SE of Sattelberg, Mt. Bolan 4000 m) (holo B, lost).
?Pedilonum saruwagedicum (Schltr.) Rauschert, Feddes Repert. 94 (1983) 463 (?= subsp. pentagonum).
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Dendrobium aurantivinosum P.Royen, Alp. Fl. New Guinea 2 (1979) 449, fig. 156 (= subsp. calcarium).
Type: NGF (Ridsdale & Galore) 33398 (holo K; iso LAE).
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Dendrobium cyatheicola P.Royen, Alp. Fl. New Guinea 2 (1979) 435, fig. 151 (= subsp. brevicaule).
Type: Hartley 12913 (holo L, iso AMES, CANB, LAE).
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Dendrobium montistellare P.Royen, Alp. Fl. New Guinea 2 (1979) 401, 404, fig. 139 (= subsp. calcarium).
Type: Nicolas 5 a (holo L).
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Dendrobium montistellare P.Royen f. albescens P.Royen, Alp. Fl. New Guinea 2 (1979) 404 (= subsp. calcarium).
Type: ANU (Wheeler) 6117 (holo CANB, iso L, LAE).
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Dendrobium quinquecristatum P.Royen, Alp. Fl. New Guinea 2 (1979) 446, fig. 155 (= subsp. calcarium).
Type: ANU (Hope) 16147 (holo CANB).
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Dendrobium teligerum P.Royen, Alp. Fl. New Guinea 2 (1979) 420, fig. 146, pl. 89 (= subsp. pentagonum).
Type: NGF (Dockrill (Elworthy]) 7991 (holo L; iso LAE).
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Dendrobium zaranense P.Royen, Alp. Fl. New Guinea 2 (1979) 441, fig. 153 (= subsp. pentagonum).
Type: NGF (van Royen) 16176 (holo L; iso K, LAE)