Masdevallia agaster Luer, Phytologia 42(5): 455. 1979.
TYPE: Ecuador. Zamora-Chinchipe: Epiphytic in cloud forest between Loja and Zamora, 1500 m, col. by Walter Teague s.n. cult. in San Francisco, 12 Dec 1978, C. Luer 3644 (holotype, SEL; detail of type).