SPECIES FACT SHEET
Scientific Name: Cystangium idahoensis (Singer & A.H. Sm.) Trappe, T. Lebel
& Castellano 2002
Order: Russulales
Family: Russulaceae
Conservation Rankings and Status:
Global: G2G3
State: OR S1, WA Not ranked
Oregon Biodiversity Information Center (ORBIC) List 1
(Ranks from ORBIC, http://orbic.pdx.edu accessed August 16, 2013)
Type Locality: USA, Squaw Meadows, Valley County, Idaho. Collected by Smith
60161, 1958. Located at MICH herbarium (holotype). Original description in
Singer, R. and A.H. Smith. 1960 as Martellia idahoensis. Studies of the
genera of sequestrate russuloid fungi by Lebel and Trappe led to amended
generic descriptions of Cystangium and elimination of the genus Martellia
(Trappe et al., 2002).
Technical Description: Sporocarp 8-40 mm broad, globose-depressed or
irregular, irregularly ridged or grooved, , white when young Gleba loculate,
white at first, in age pale brown. Odor none; Spores globose to broadly
ellipsoid, 10-13 x 9-11.5 microns, amyloid, ornamentation echinate to
verrucose, 1-1.5 microns tall, unconnected or anastomising to form compound
warts, few lines or ridges
This Cystangium is characterized by the relatively large, echinate to verrucose
(small rounded warts) spores and the presence of macrocystidia.
Life History: This taxon is hypogeous (grows underground) and a presumed
ectomycorrhizal former. Sporocarps are formed below the soil surface and are
associated with Pacific silver fir, subalpine fir, noble fir, Engleman spruce and
mountain hemlock. Fruits August through October. It depends on mycophagy
(consumption by animals) for spore dispersal.
Range, Distribution, and Abundance: This species is very rare; globally only
known from three locations in Oregon and Idaho, with two of the populations
from the Northwest Forest Plan area in Oregon.
Oregon: Lane Co., Lamb Butte Scenic Area, Ollallie Trail, Willamette National
Forest; Benton Co., Marys Peak Campground, Siuslaw National Forest.
FS/BLM lands in Oregon and Washington: Documented on the Willamette and
Siuslaw NFs.
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Habitat Associations: Populations are located in the Pacific silver fir, and
western hemlock plant associations. Both are found in wetland types.
Populations range from 2738-3455 feet in elevation and are found one each on
north, south and east-facing slopes.
Threats: Because the species is mycorrhizal any adverse impact to host trees
or actions that would disturb the soil and duff in the vicinity of fruiting bodies
could have an adverse effect on the species. Fire could be a potential harmful
agent to Cystangium idahoensis because the plant associations in which it is
found are subject to infrequent but stand-replacing wildfires.
Conservation Considerations: Buffer known populations from management
activities that include tree removal and soil compaction or disturbance.
Consider buffering populations from prescribed burns.
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/
David Aurora does not include this species in Mushrooms Demystified,
although he treats other Martellia species on p. 742.
Prepared by: Jenny Lippert, Willamette National Forest
Date: March, 2013
Edited by: Rob Huff, BLM/FS Portland, Oregon
Date: January, 2014
ATTACHMENTS:
(1)
References
(2)
Map of Species Distribution
(3)
Photographs of Species
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ATTACHMENT 1. References
Castellano, M.A., J.E. Smith, T. O’Dell, E Cazares and S. Nugent. 1999.
Handbook to the Strategy 1 Fungal Species in the Northwest Forest Plan, GTR476. USDA Forest Service, PNW Research Station, Corvallis.
Castellano, M.A and T. O’Dell. 1997. Management Recommendations for survey
and manage fungi. Version 2.0. Group 3: 1-20.
Singer, R. and A.H. Smith. 1960. Mem. Torrey Bot Club 21(3): 1-122.
Trappe, James M., Teresa Lebel & Michael A. Castellano. 2002. Nomenclatural
revisions in the sequestrate russuloid genera. Mycotaxon 81: 195-214.
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ATTACHMENT 2. Map of Species Distribution in OR/WA
Map is missing site from the Siuslaw National Forest.
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ATTACHMENT 3: Photo of Cystangium idahoensis
From the MycoBank Website
http://www.mycobank.org/MycoTaxo.aspx?Link=T&Rec=333814
The best photos are from the Handbook to Strategy 1 Species (Castellano,
1999) but are copy righted. Photos show the truffle with white-colored internal
and external
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