10 September 1958.
Zacatecas, Mexico
Locality: 82 miles from Fresnillo on the road from Zacatecas, El Alamo, 7 miles from the Durango border.
Coordinates: 23.5000, -103.1667
(Map it)
Elevation: 2350m.
Environment description: In rich leaf mould under Juniperus deppeana.
Comment: USA PI 251740 - Haw 1473