CACTOLOGIA PHANTASTICA 1 (2018): 1-16 ISSN 2590-3403 DOI 10.5281/zenodo.2543879 16 New Nothogenera and 15 New Combinations in Hylocereeae (Cactaceae) By MAARTEN H. J. VAN DER MEER The tribe Hylocereeae as circumscribed by Korotkova et al. (2017) consists of the genera Acanthocereus, Aporocactus, Disocactus, Epiphyllum, Selenicereus, Pseudorhipsalis, Kimnachia and Weberocereus. In recent years several nomenclatural changes were proposed: Cruz et al. (2016) reinstated the genus Aporocactus and moved Epiphyllum anguliger, E. crenatum and E. lepidocarpum to Disocactus; Hunt (2017) reduced Hylocereus to synonymy under Selenicereus; and Korotkova et al. (2017) moved Weberocereus glaber and W. tonduzii to Selenicereus. Many species belonging to Hylocereeae are grown as ornamental plants for their often spectacular flowers. Since the early 1900s literally thousands of interspecific and intergeneric hybrids have been created, giving rise to dozens of nothogenera and nothospecies. Many of these do not reflect the name changes mentioned above. Therefore, 16 new nothogenera and 15 new combinations for nothogenera are proposed in this article. 1