Source of the organism. Enrichment cultures were
established from reddish mat material that was attached to the
calcareous sinter of a small hot spring in the Upper Terrace
area of Mammoth Hot Springs, Yellowstone National Park.
The series of springs sampled were the so-called Stygian
Springs, which lie on top of a ridge in the southwest corner
of the Upper Terraces. The springs in this area have been
mapped by Castenholz (2), and the Stygian Springs are
indicated