SPECIES FACT SHEET
Common Name: gastroid bolete
Scientific Name: Gastroboletus vividus Trappe & Castellano 2000
Division: Basidiomycota
Class: Agaricomycetes
Order: Boletales
Family: Boletaceae
Conservation Rankings and Status:
Global:G2?
State: OR S1
Oregon Biodiversity Information Center (ORBIC) List 1
(Ranks from ORBIC, http://orbic.pdx.edu accessed August 16, 2013)
Technical Description: Sporocarps 30-50 x 35-65 mm, boletoid but often
appearing aborted or misshapen, with cap margins strongly upturned, the cap
surface yellow with red areas or blushed red overall, fry, felty. Flesh pale
yellow, very slowly staining pale red where exposed, with narrow, olive to red
zones at tube attachment and immediately beneath cap surface. Tubes 10-20
mm long, olive, aligned from near-horizontal to near-vertical, depending on
location on sporocarp. Tube mouths circular to ellipsoid and 0.5-2.0 mm
wide, initially brilliant yellow but soon becoming olive and by maturity redorange to dark red, not bluing where bruised. Stem 20-30 x 10-25 mm wide,
red furfuraceous at apex, abruptly bulbous below tube layer and brilliant
yellow to sordid yellow. Odor and taste not distinctive. Spores tapering
toward each end, symmetrical, smooth, (11-) 13-18 (-22) x 6-7 um, thin-walled,
in KOH golden yellow singly and bright brown-yellow in mass, not reacting with
Melzer’s reagent, moderate to deep blue in cotton blue.
The irregularly shaped, buried or partially buried boletoid sporocarp with a
short, poorly developed stem, and cap with variously aligned hymenial surfaces
distinguishes Gastroboletus within the family Boletaceae. Within the genus,
the bright yellows and reds of the fresh sporocarps with inamyloid spores
distinguish this species.
Life History: This sequestrate fungus appears to be mycorrhizal with various
species of Pinaceae, particularly Abies magnifica and Tsuga mertensiana, and
is dependent on mycophagy (consumption by animals) for spore dispersal.
Sporocarps found July – September.
Range, Distribution and Abundance: Known from the Sierra Nevada in
California to the Washington Cascades. Approximately 6 sites within Oregon
and Washington portions of the Northwest Forest Plan Area, including the
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Washington Eastern Cascades, Oregon Eastern Cascades, Oregon Western
Cascades and Oregon Klamath Physiographic Provinces. There were no
detections of this species recorded during Random Grid CVS/FIA plot surveys.
FS/BLM lands in Oregon and Washington: Documented on the OkanoganWenatchee, Rogue River-Siskiyou and Willamette National Forests. Also within
Crater Lake National Park.
Habitat Associations: Found in Mountain Hemlock (67%), Douglas Fir (17%)
and White Fir-Grand Fir (17%) vegetation zones at elevations of 4266-6747
feet.
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 of large 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-fuver1-2008-12.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
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ATTACHMENTS:
(1)
References
(2)
Map of Species Distribution
(3)
Photographs of Species
ATTACHMENT 1: References
Arora, David. 1979. Mushrooms Demystified – A Comprehensive Guide to the
Fleshy Fungi. Ten Speed Press, Berkeley, California. 959 pp.
Castellano, M.A., J.E. Smith, T. O’Dell, E. Cazares, and S. Nugent. 1999.
Handbook to Strategy 1 Fungal Species in the Northwest Forest Plan. PNWGTR-476.
Cushman, Kathleen and Rob Huff. 2007. Conservation Assessment for Fungi
Included in Forest Service Regions 5 and 6 Sensitive and BLM California,
Oregon and Washington Special Status Species Programs. R6 USFS and
OR/WA BLM Interagency Special Status/Sensitive Species Program ISSSSP).
http://www.fs.fed.us/r6/sfpnw/issssp/planning-tools/
Ferriel, Jenifer and Katie Grenier. 2008. Annotated Bibliography of
Information Potentially Pertaining to Management of Rare Fungi on the Special
Status Species List for California, Oregon and Washington. R6 USFS and
OR/WA BLM Interagency Special Status/Sensitive Species Program (ISSSSP).
http://www.fs.fed.us/r6/sfpnw/issssp/planning-tools/
Oregon Biodiversity Information Center. 2010. Rare, Threatened and
Endangered Species of Oregon. Portland State University, Institute for Natural
Resources. 109 pp.
http://orbic.pdx.edu/rte-species.html
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ATTACHMENT 2: Map of Species Distribution in OR/WA
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ATTACHMENT 3: Photo of Gastroboletus vividus
Photo courtesy of J.M. Trappe
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