Observation 3143: Calvatia pachyderma (Peck) Morgan

When: 2007-04-24

Collection location: Point Reyes National Seashore, Marin Co., California, USA [Click for map]

Who: Ron Pastorino (Ronpast)

No specimen available

Found in open grassy area. Fits the description of C. gigantea except they are on the small side, 7-8cm across. West coast version of Calvatia booniana seems more apt.

Species Lists



Proposed Names

80% (3)
Eye3 Eyes3
Used references: Based on the size, habitat, thick endoperidium and e-mail from Fred Stevens, I now believe these are C. pachyderma.
28% (1)
Recognized by sight

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Habitat question
By: Ron Pastorino (Ronpast)
2007-04-24 19:27:48 PDT (-0700)
I was put off that trail by the habitat..“confined to the arid or semi-arid regions of western North America”. But now see that there is a “less warty species along the west coast”. Will make the change.
Calvatia booniana
By: Darvin DeShazer (darv)
2007-04-24 18:59:02 PDT (-0700)

The western giant puffball is Calvatia booniana and this looks like it. It also lacks a sterile base as does Calvatia gigantea but instead of a smooth exoperidium it has one that breaks into large flat scales that become lightly pigmented in the center.

Created: 2007-04-24 13:51:55 PDT (-0700)
Last modified: 2017-09-21 00:44:04 PDT (-0700)
Viewed: 164 times, last viewed: 2018-11-04 16:32:21 PST (-0800)
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