Epidendrum subgenus Aulizeum was raised from sectional status by Lindley in 1853. According to the Latin diagnosis, this taxon included those species of Epidendrum with a multi-lobate lip adnate to the column, with pseudobulbous stems, with the flowers sessile or born on racemes or panicles. In his further English description, Lindley stated that the species in this taxon have a horn-like stem which is only leafy at the end, and racemose inflorescences. In 1861, Reichenbach listed 32 species in this subgenus; of these, Kew recognizes 31 as separate species.
In 2004, Withner and Harding separated the eight species that Lindley had placed in E. subg. Aulizeum into the genus Coilostylis, a change that has not been widely accepted.Carl Leslie Withner & Patricia A. Harding. The Cattleyas and their relatives: the debatable Epidendrums. Timber Press, Portland, OR. 2004 Additionally, several species have been moved into other genera, leaving thirteen still in Epidendrum subgenus Aulizeum:
Artorima erubescens (Lindl.) Dressler & G.E.Pollard (1971), listed by Reichenbach on p. 350 as E. erubescens Encyclia kermesina (Lindl.) P.Oriz (1995), listed by Reichenbach on p. 349 as E. kermesinum Encyclia parallela (Lindl.) P.Ortiz(1995), listed by Reichenbach on p. 351 as E. parallelum Epidendrum ciliare (L.) Withner & P.A.Harding (2004)139, listed by Reichenbach on p. 347 Epidendrum coryophorum (Kunth) Rchb.f. (1861), listed by Reichenbach on (p. 347) as E. coriophorum Epidendrum falcatum (Lindl.) Withner & P.A.Harding (2004)143, listed by Reichenbach on p. 348 Epidendrum jajense Rchb.f. (1854), listed by Reichenbach on p. 352 Epidendrum miserum Lindl. (1841), listed by Reichenbach on p. 354 as E. pulchellum Epidendrum moritzi Rchb.f. (1850), listed by Reichenbach on pp. 350–351 Epidendrum oerstedii Rchb.f. (1852), listed by Reichenbach on p. 348 as both E. costaricense and E. oerstedii. Epidendrum parvilabre Lindl. (1845), listed by Reichenbach on p. 351 Epidendrum polystachyum Kunth (1816), listed by Reichenbach on p. 350. Epidendrum purpurascens Focke, listed by Reichenbach on p. 349 as E. clavatum. Epidendrum refractum Lindl. (1843), listed by Reichenbach on p. 354 Epidendrum rupestre Lindl. (1841), listed by Reichenbach on p. 352 Epidendrum saxatile Lindl. (1841), listed by Reichenbach on p. 352 Epidendrum stramineum Lindl. (1853), listed by Reichenbach on p. 351 Epidendrum tipuloideum Lindl.(1853), listed by Reichenbach on p. 350 Epidendrum viviparum Lindl., listed by Reichenbach on pp. 348–349 Epidendrum volutum Lindl. & Paxton (1852), listed by Reichenbach on p. 354 Oestlundia luteorosea (A.Rich. & Galeotti) W.E.Higgins(2001), listed by Reichenbach on p. 347 as E. seriatum Prosthechea arminii (Rchb.f.) Withner & P.A.Harding(2004)254, listed by Reichenbach on p. 353 as E. arminii Prosthechea brachychila (Lindl.) W.E.Higgins (1998), listed by Reichenbach on pp. 352–353 as E. brachychilum Prosthechea concolor (Lex.) W.E.Higgins (1998), listed by Reichenbach on p. 352 as E. pruinosum Prosthechea grammatoglossa (Rchb.f.) W.E.Higgins (1998), listed by Reichenbach on p. 350 as E. grammatoglossum Prosthechea hartwegii (Lindl.) W.E.Higgins (1998), listed by Reichenbach on p. 354 as E. hartwegii Prosthechea lindenii (Lindl.) W.E.Higgins(1998), listed by Reichenbach on p. 353 as E. fallax Prosthechea pastoris (Lex.) Espejo & López-Ferr(2000), listed by Reichenbach on pp. 351–352 as E. venosum Prosthechea rhynchophora (A.Rich & Galeotti) W.E.Higgins (1998), listed by Reichenbach on p. 352 as E. rhynchophorum Prosthechea sceptra (Lindl.) W.E.Higgins (1998), listed by Reichenbach on p. 353 as E. sceptrum Prosthechea serrulata (Sw.) W.E.Higgins (1998), listed by Reichenbach on p. 347 as E. serrulatum
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