Amanita calyptroderma

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Amanita calyptroderma
Amanita calyptroderma Oakland.JPG
Scientific classification edit
Kingdom: Fungi
Division: Basidiomycota
Class: Agaricomycetes
Order: Agaricales
Family: Amanitaceae
Genus: Amanita
A. calyptroderma
Binomial name
Amanita calyptroderma
G.F. Atk. & V.G. Ballen 1909

Amanita calyptrata
Amanita lanei

Amanita calyptroderma
View the Mycomorphbox template that generates the following list
gills on hymenium
cap is flat or convex
hymenium is free
stipe has a ring and volva
spore print is white
ecology is mycorrhizal
edibility: not recommended

Amanita calyptroderma also known as coccora, coccoli or the Pacific amanita,[1] is a white-spored mushroom that fruits naturally in the coastal forests of the western United States during the fall and winter and spring.


This mushroom's cap is about 10–25 cm in diameter, usually orange-brown in color (but sometimes white),[2] and partially covered by a thick white patch of universal veil. It has white, close gills.[3] Its cream-colored stalk is about 10–20 cm in length and 2–4 cm in width,[2] adorned with a partial veil. It has a partially hollow stem (filled with a stringy white pith), and a large, sacklike volva at the base of the stalk.[2]

The spores of this species, which are white,[2] do not change color when placed in a solution of Melzer's reagent, and thus are termed inamyloid.[3] This characteristic in combination with the skirt-like annulus and absence of a bulb at the base of the stalk place this mushroom in the section Caesareae.

Distribution and habitat[edit]

This mushroom occurs in conifer forests,[3] forming mycorrhizae with madrone (Arbutus menziesii) in the southern part of its range (Central California northwards to Washington). However, in the northern part of its range (Washington to southern Canada), its preferred host is Douglas fir (Pseudotsuga menziesii).

Amanita calyptroderma in Oakland, California


Experienced mushroom hunters regard this mushroom as a good edible species,[4] but caution must be exercised when collecting A. calyptroderma for the table, since it can be confused with other species in the genus Amanita.[2] This genus contains some of the deadliest mushrooms in the world, most notably A. phalloides and A. ocreata.

Similar species[edit]

Amanita vernicoccora is a closely related edible species,[5] which fruits in hilly or mountainous areas from late winter to spring. Otherwise similar in appearance, its cap is yellow.[2] A. caesarea is also related and edible.[3]

The deadly poisonous A. phalloides is similar in appearance.[3]

See also[edit]


  1. ^ "Standardized Common Names for Wild Species in Canada". National General Status Working Group. 2020.
  2. ^ a b c d e f Davis, R. Michael; Sommer, Robert; Menge, John A. (2012). Field Guide to Mushrooms of Western North America. Berkeley: University of California Press. pp. 67–68. ISBN 978-0-520-95360-4. OCLC 797915861.
  3. ^ a b c d e Trudell, Steve; Ammirati, Joe (2009). Mushrooms of the Pacific Northwest. Timber Press Field Guides. Portland, OR: Timber Press. pp. 83–84. ISBN 978-0-88192-935-5.
  4. ^ Phillips, Roger (2010). Mushrooms and Other Fungi of North America. Buffalo, NY: Firefly Books. pp. 20–21. ISBN 978-1-55407-651-2.
  5. ^ Davis, R. Michael; Sommer, Robert; Menge, John A. (2012). Field Guide to Mushrooms of Western North America. Berkeley: University of California Press. p. 82. ISBN 978-0-520-95360-4. OCLC 797915861.

External links[edit]