• Proposed
  • 2Under Assessment
  • 3Preliminary Assessed
  • 4Assessed
  • 5Published

Ramaria amyloidea Marr & D.E. Stuntz

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Scientific name
Ramaria amyloidea
Marr & D.E. Stuntz
Common names
IUCN Specialist Group
Mushroom, Bracket and Puffball
Assessment status
Proposed by
Noah Siegel
Comments etc.
Noah Siegel

Assessment Notes

Taxonomic notes

Described based on a collection made in the central Washington Cascade Range by (Marr & Stuntz 1973).
Field identification of Ramaria is often very difficult, with macromorphological differences being subtle and often intergrading (especially in older fruitbodies).

Why suggested for a Global Red List Assessment?

Ramaria amyloidea is an uncommon but widespread species in the Pacific Northwest, currently known from ~45 locations.

Habitat requirements are largely unknown, but it appears to be restricted to mature or old growth forests, which are in decline in the Pacific Northwest due to stand replacing fires and logging.

Geographic range

Known from the Cascade Range in Washington and Oregon, the northern Rocky Mountains in Idaho, and a single sites in the Coast Range in Oregon and in the Siskiyou Range in California. Most Cascade Range collections come from drier forests on the east side of the Cascade crest.

Population and Trends

Population occurs over a widespread area, with some continuous records in the Cascade Range, and some disjunct outliers. Currently known from ~45 locations (Siegel et al. 2019, Mycoportal 2021). Data to fully assess trends is lacking.

Population Trend: Uncertain

Habitat and Ecology

Ectomycorrhizal with conifers; especially Fir (Abies spp.), Western Hemlock (Tsuga heterophylla), and Douglas-fir (Pseudotsuga menziesii). Believed to be restricted to mature and old growth forest, although many records do not disclose habitat information. Fruit bodies are solitary or scattered from ground, fruiting in fall.

Temperate Forest


This is a ectomycorrhizal fungus species dependent on living host trees for viability. The major threat to this species and its co-occurring co-generic brethren is habitat destruction, via the logging of old-growth forests to which this species has a preference for. The extent of old growth forest in the Pacific Northwest of North America has declined 90% in the last century (Society of American Foresters 1984, Haynes 1986).

Climate change and droughts, along with forest management practices has made western forests highly susceptible to stand replacing forest fires. Fire is big threat to this species’ populations. A stand replacing fire could severely degrade and/or diminish its current range. Logging and machine clearing of understory vegetation should be limited in mature and old growth forest in areas where this species might occur.

Unintentional effects: large scale (species being assessed is not the target) [harvest]Increase in fire frequency/intensityDroughts

Conservation Actions

This species is included on the United States Forest Service Northwest Forest Plan Survey and Manage list of rare/old growth forests dependent fungi, and has been actively surveyed for since the late 1990’s. (Castellano et al. 1999). Included on the Oregon Natural Heritage rare fungi list (Oregon Biodiversity Information Center 2019), as a S3 species, and the Washington Natural Heritage list as a S1 species.

Logging or machine clearing of understory should be limited in mature (or old growth forest) in areas this species in known to occur.

Research needed

A better understanding of habitat requirements of this species, and if it is restricted to mature and old growth forests. Continued surveys for this species, especially in the Siskiyou Range in California.

Population size, distribution & trendsLife history & ecology

Use and Trade

None known.


Castellano, M.A., Cázares, E., Fondrick, B. and Dreisbach, T. 2003. Handbook to additional fungal species of special concern in the Northwest Forest Plan (Gen. Tech Rep. PNW-GTR-572). U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station: Portland, OR. 144 p.

Exeter, R.L., Norvell, L. and Cázares, E. 2006. Ramaria of the Pacific Northwestern United States. United States Department of Interior, Bureau of Land Management: Salem, OR. 157 p.

Haynes, T.W. 1986. Inventory and value of old-growth in the Douglas-fir region. PNW-RN 437. U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station, Portland, OR.

Marr, C.D. and Stuntz, D.E. 1973. Ramaria of Western Washington (Bibliotheca Mycologica, Band 38). J. Cramer: Vaduz, Liechtenstein. 232 p.

MyCoPortal. 2021. http://mycoportal.org/portal/index.php. Accessed on February 15.

NatureServe. 2021. NatureServe Explorer. https://explorer.natureserve.org/Taxon/ELEMENT_GLOBAL.2.637286/Ramaria_amyloidea. NatureServe, Arlington, Virginia. Available https://explorer.natureserve.org/. (Accessed: Feb 15 2021).

Oregon Biodiversity Information Center. 2019. Rare, Threatened and Endangered Species of Oregon. Institute for Natural Resources, Portland State University, Portland, Oregon.

Siegel, N., Vellinga, E.C., Schwarz, C., Castellano, M.A. and Ikeda, D. 2019. A Field Guide to the Rare Fungi of California’s National Forests. Bookmobile: Minneapolis, MN. 313 p.

Society of American Foresters. 1984. Scheduling the harvest of old growth : Old-growth forests in the Pacific Northwest : a position of the Society of American Foresters and Report of the SAF Task Force on Scheduling the Harvest of Old-Growth Timber. Bethesda, MD.

Washington Natural Heritage Program List of Macrofungi https://www.dnr.wa.gov/publications/amp_nh_macrofungi.pdf

Country occurrence

Regional Population and Trends

Country Trend Redlisted