Type: Mexico: Oaxaca; 6 km east of El Camaron, elev. ca. 2000 m. Epiphytic on Quercus sp., growing intermingled with typical T ionantha var. stricta, Koide & Schuster s.n. legit., April 1982. Flowered in cultivation, P. Koide s.n. (SEL, holotype; US, MEXU, isotypes).