07 October 1958.
Veracruz de Ignacio de la Llave, Mexico
Locality: Near Perote, km 306.5 from Mexico, road from Las Vigas to Jalapa, upper edge of La Joya village, Malpais de la Joya, walled enclosure on the S side of the road.
Coordinates: 19.5667, -97.2333
(Map it)
Elevation: 2100m.
Environment description: On moss-covered wall tops, holes in lava, among rocks and grasses and other herbs; in partial shade of pines.