Observation 62965: Amanita calyptroderma G.F. Atk. & V.G. Ballen

When: 2011-01-29

Collection location: Mountain Park, San Rafael, Marin Co., California, USA [Click for map]

Who: Len (placeport)

No specimen available

I thought these were a pair of flying saucers with little green aliens, they were so big. In daylight the caps had a certain greenish tinge, which does not appear so well in the photos. They pushed up a lot of dirt. Growing on a hillside in grass with nearby coast live oaks. Odor of gills and cap is very slightly fishy.

Proposed Names

62% (3)
Eye3 Eyes3
Recognized by sight: Cap 190 & 243 mm (7.5" & 9.5"), pale yellow-tan with tinge of green, with large, thick white patch in center. Gills and stipe cream to pure white. Stipe diameter 44 mm (1.75 in.) straight, even, not markedly bulbous at base, with high, skirt-like annulus and volva. Oh, yes, the stipe blushed reddish when rubbed, like A. novinupta would do, so perhaps these are atypical of A. calyptroderma.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Don’t know…
By: Len (placeport)
2011-02-01 20:24:56 PST (-0800)

I looked around a lot for more but only found these two. But if I have a chance to return there I will look again. Here are the exact lat/long coordinates, if anyone’s interested:


Unfortunately when I returned home after a couple of days my specimens had deteriorated and developed maggots. I have preserved some dried samples of the maggot-free parts of stipes and caps in case they may be useful.

Could these be something like the mythical green calyptroderma?

Nearby, within .5 km, I found what I think were a fat Panther and some small A. velosas — have not posted these obs. yet.

these are interesting…
By: Debbie Viess (amanitarita)
2011-02-01 19:58:50 PST (-0800)

can you collect more?

Don’t worry…
By: Len (placeport)
2011-01-31 12:05:52 PST (-0800)

I didn’t eat them! Too much likelihood of confusion with the Death Cap, especially with the slightly greenish hues of the caps.

Created: 2011-01-31 11:03:32 PST (-0800)
Last modified: 2011-02-02 02:04:58 PST (-0800)
Viewed: 113 times, last viewed: 2017-06-08 06:33:05 PDT (-0700)
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