E-Flora BC: Electronic Atlas of the Flora of British Columbia

Amanita farinosa Schwein.
powder-cap Amanita

Species account author: Ian Gibson.
Extracted from Matchmaker: Mushrooms of the Pacific Northwest.

Introduction to the Macrofungi

© Michael Beug  Email the photographer   (Photo ID #52818)

E-Flora BC Static Map
Distribution of Amanita farinosa
Click here to view the full interactive map and legend
Details about map content are available here
Click on the map dots to view record details.

Species Information

Distinguishing features are grayish to grayish brown powdery cap with striate margin, whitish or grayish powdery stem with small round bulb, absence of ring, and volva consisting only of powdery residue. Note that specimens from Pacific Northwest are larger than those from other parts of the country. Tulloss(6) comment 'The basidiome of this western entity is two to three times the size of the true A. farinosa of eastern North America and Central America; and the length of the marginal striations on the pileus is relatively short in the western "farinosa." The spores are proportionately narrower in the western entity (but a larger sample should be checked).' Amanita farinosa is uncommon: New York Botanical Garden has collections from WA and also AL, CT, DC, NY, OH, MA, NC, NJ, PA, TN, VA, Costa Rica, Japan. It occurs from QC to at least Costa Rica (Tulloss(5)). There is a collection from BC at University of British Columbia, and Oregon State University has a collection from OR labeled as this species. Miller(14) found it in Japan and Korea. Tulloss(6) examined collections of the western entity from WA, OR, and CA.
2.5-6.5cm across, convex to flat or depressed; gray to gray-brown; covered with granular to farinose universal veil remnants; margin striate, (Lindgren), 2.5-7.5cm across, bell-shaped becoming convex to flat; pale gray to brownish gray; covered with dense gray powder, (Lincoff), mouse gray to grayish brown; not viscid, covered with grayish mealy dust or flakes, margin deeply striate, (Goetz, D.), 4.7-6.9cm across (Tulloss(6))
whitish (Lindgren)
free, close to subdistant, subgills truncate; white; edges fimbriate [fringed], (Lindgren), free, close, broad; white, (Lincoff), white or whitish, (Goetz, D.)
3-8cm x 0.4-0.8cm, whitish to gray; granular (from grayish, powdery universal veil remnants) to smooth when old, (Lindgren), 2.5-7.5cm x 0.3-1cm, with slight basal bulb; grayish to dirty white; powdery, (Lincoff), VOLVA remains consisting only of powdery residue on bulb, (Lindgren), volva sometimes disappearing (Goetz), 5.5-7cm x 1.0 - 1.8cm (Tulloss(6))
ring absent (Lindgren)
not distinct (Lindgren), strong mink smell in older specimens (Phillips)
Microscopic spores:
spores 6.3-9.4 x 4.5-7.9 microns, nearly round to round, inamyloid, (Lindgren), 6.3-9.4 x 4.5-8 microns, round to elliptic, (Lincoff), spores(6.5)7.5-9.2(10.6) x (5.0)5.5-7.2(7.6), broadly elliptic to elliptic(infrequently elongate or nearly round), smooth, inamyloid, colorless, thin-walled, "monoguttulate, sometimes with additional small granules", (Tulloss(6))
Spore deposit:
white (Lindgren)

Habitat / Range

single, with conifers, fall, (Lindgren), in open conifers (Goetz), on ground under conifers and hardwoods, also in grassy wood borders, (Lincoff)

Taxonomic and Nomenclatural Links

Additional Range and Status Information Links


not edible (Phillips)

Additional Photo Sources

Related Databases

Species References

Lincoff(2)*, Phillips(1)*, Lindgren(1), Goetz, D.(1), Miller(14)*, Barron(1)*, Tulloss(5), Tulloss(6), NYBG(1)

References for the fungi

General References