Conservation Rankings and Status:
Global: G1G2
State: OR S1, WA Not ranked
Oregon Biodiversity Information Center (ORBIC) List 1
(Ranks from ORBIC, http://orbic.pdx.edu accessed August 16, 2013)
Technical Description:Cap 30-50 mm broad, appressed fibrillose with an olive-yellow sheen when young, disc pale brown, margin pale yellow-tan; cap surface dark inky violet, becoming slowly purple-brown in KOH.Gills adnate, close, olive-yellow at first, then more or less ochre-yellow.Stem 60-120 x 4-8 mm, diameter +/- uniform, fibrillowse, dingy yellow to the base with a covering of brown fibrils.Flesh dingy brown. Odor and Taste indistinct.Spores ellipsoid to ovate, 7-9.2 x 4.5-5.5 um, pale brown to fulvous in KOH, verruculose.
Dermocybe is variously regarded as a subgenus of Cortinarius, or as a free-standing genus.Species of Dermocybe are typically small, slender-stermmed, brightly colored mushrooms with neither cap nor stalk viscid.D. humboldtensis is characterized by a green-brown cap with an olive-yellow sheen, olive-yellow gills, dingy yellow stem and rusty-brown spores.D. idahoensis has rusty- to orange-ochraceous gills and slightly larger spores.
Life History:This mushroom appears to be mycorrhizal with various species of Pinaceae.Sporocarps found in November and December.
Range, Distribution and Abundance:Known globally only from approximately 5 locations within the Oregon and California portions of the Northwest Forest Plan Area, from Humboldt County CA to Douglas County OR.Includes the Oregon Klamath and Oregon Coast Range Physiographic Provinces.There were no detections of this species during Random Grid CVS/FIA plot surveys.
FS/BLM lands in Oregon and Washington: Documented from Roseburg District BLM.
Habitat Associations:Occurs in White Fir-Grand Fir vegetation zones at elevations of 1337-1781 feet.Associated species include Douglas fir and ponderosa pine.
Threats:As with mycorrhizal fungi in general, current literature suggests that threats to local occurrences of this species include events and/or activities that negatively impact either the fungal mycelium or the mycorrhizal hosts.Such impacts can be caused by moderate to severe fire, removal of a large percentage of host plants (and the attendant reduction in canopy cover and reduction in moisture content of upper soil layers), removal oflarge woody debris, and soil compaction.Such impacts can reduce both fungal biomass and species diversity within communities of ectomycorrhizal fungi for periods ranging from several years to multiple decades.
Conservation Considerations:Revisit known localities to confirm persistence and determine extent of populations.Conduct surveys to locate new populations.Buffer known sites from adjacent vegetation management activities.When conducting vegetation management activities in areas with good habitat potential, consider leaving scattered and clumped host trees and ample coarse woody debris, while minimizing soil compaction and burn severity of activity-related fires.
Other pertinent information (includes references to Survey Protocols, etc):The survey protocol for sensitive fungi is located on the ISSSSP website: http://www.fs.fed.us/r6/sfpnw/issssp/documents/inventories/inv-sp-fu-ver1-2008-12.pdf.
The survey protocol for Survey and Manage fungi is located on the Survey and Manage website: http://www.blm.gov/or/plans/surveyandmanage/protocols/
Prepared by:Rick Dewey, Deschutes NF
Date:April, 2013
Edited by:Rob Huff, BLM/FS Portland, Oregon
Date:January, 2014
