Hanging gardens and wet wall habitats have been studied for the past several years in many arid regions of the Intermountain West. One unusual large wet wall habitat in Zion National Park was found to be covered with a mucilaginous red-colored growth of the filamentous gliding bacterium Thioploca ingrica Visloukh. This is the only habitat we have examined where the predominant matrix-forming organism was a bacterium rather than an alga.
Rushforth, Samuel R.; Burton, Sheril D.; Johansen, Jeffrey R.; and Grimes, Judith A.
"The bacterium Thioploca ingrica on wet walls in Zion National Park, Utah,"
Great Basin Naturalist: Vol. 40
, Article 10.
Available at: http://scholarsarchive.byu.edu/gbn/vol40/iss1/10