07 September 1983.
Hidalgo, Mexico
Locality: Hwy 85, Zimapan to Tamazunchale, N of Barranca los Marmoles, about 4 km E along track to La Encarnacion.
Coordinates: 21.0000, -99.1333
(Map it)
Elevation: 2380m.
Environment description: Pine-oak forest in a narrow, steep valley, close to excavation for marble; among rocks, in reddish-brown soil.