This species is restricted to an area of about 377km² in the Siskiyou Mountains in southern Oregon (mostly upper Applegate River drainage, Jospehine and Jackson Counties) and northern California (Siskiyou County: near Hutton Guard Station, the Cook and Green Guard Stations, along Joe and Dutch creeks in upper Applegate River drainage and along Seiad and Horse creeks in Klamath River drainage), USA (California Department of Fish and Game 1990). In Oregon, it is found at elevations of 490-1,463m asl (Leonard et al. 1993).
Habitat and Ecology
This species, as with its sister species (P. elongatus; Welsh and Lind 1995), is highly associated with rocky talus slopes in areas of dense mature and late-seral forest (Welsh and Lind 1995; Bury 1998; Ollivier, Welsh and Clayton 2001). Most individuals occur in talus and rocky soils or slopes and, occasionally, are found under logs, in leaf-litter, and under other substrates if talus is nearby (Nussbaum, Brodie and Storm 1983; Bury 1998; Bury and Welsh 2005). Eggs (2-18) are laid on land apparently in cavities in talus (Nussbaum, Brodie and Storm 1983).
It is locally abundant in a few sites and moderately common at many others (R.B. Bury pers. comm. 2003).
The most serious threat appears to be gradual destruction of over story vegetation by clear-cutting in areas of rock outcrops and talus slopes, which results in drying out of the species' microhabitat (California Department of Fish and Game 1990).
Almost all populations are on lands managed by the U.S. Forest Service. Some protection is afforded in Klamath National Forest by an "Interim Management Direction" that specifies normal stream course protection measures designed to maintain water quality and fisheries habitat (California Department of Fish and Game 1990). Once considered a Federal Candidate Species for listing, Siskiyou Mountains salamanders are recognized as a species of special concern by Oregon and California.
Red List Status
Listed as Endangered because its Extent of Occurrence is less than 5,000 km2, its distribution is severely fragmented, and there is continuing decline in the extent and quality of its habitat in Oregon and California.
This species is morphologically somewhat similar to Plethodon elongatus, but it is genetically distinct.
Geoffrey Hammerson, Bruce Bury 2004. Plethodon stormi. The IUCN Red List of Threatened Species 2004: e.T17628A7209870. http://dx.doi.org/10.2305/IUCN.UK.2004.RLTS.T17628A7209870.en .Downloaded on 20 February 2019