 The most destructive element of this proposed program is the use of herbicide to effect a kill of virtually all vegetation in large areas of power line rights-of-way.Ring Mountain in Marin County, California is a location of occurrence of "H. congestum"; in fact the sole population that is actively managed is found on Ring Mountain, a nature reserve on the Tiburon Peninsula managed by The Nature Conservancy.Many of the existing colonies are in San Mateo County; two of these in the vicinity of the Crystal Springs Reservoir are in danger of destruction by an expanded trail system proposed by the county.