Observation 53765: Amanita Pers.

When: 2010-09-25

Collection location: Mount Hood, Mount Hood National Forest, Oregon, USA [Click for map]

Who: Sava Krstic (sava)

No specimen available



Proposed Names

87% (3)
Eye3 Eyes3
Recognized by sight
-19% (2)
Recognized by sight: This is well within the range of features I see in the Cascades
Used references: Spore size matches MD

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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Additional pictures
By: Richard Bishop (Leciman)
2010-11-15 23:37:58 MST (-0700)

I’ve posted some additional pictures under observation #58993.—Leciman

In addition.
By: R. E. Tulloss (ret)
2010-11-13 19:01:09 MST (-0700)

The volva on the lower stem of the specimen on the left is friable, not membranous; also, the volva on the cap is of the same consistency/appearance.

I tried to see the short gills on the underside of the cap; and, although I can find several, I am unable to convince myself as to whether they are squarely cuf-off (truncate) or slope toward the cap flesh more slowly (attenuate).

From the volva, and that fact that a distinct bulb is present at least on the specimen on the right, I think we can say we are in either sect. Amanita or section Validae. The striations on the cap margin are a sort of “push” toward section Amanita.

Remember, these specimens have been mauled by the critters and possibly other fungi, bacteria, or who knows what.

Perfect precision may not be possible. :-)


By: R. E. Tulloss (ret)
2010-11-13 18:50:30 MST (-0700)

I’ve been away for a few days, and I’m taking a second look at this image.

Here’s what I notice. The cap on the left has a striate margin and appears incompletely expanded. This combination suggests the species depicted would normally develop a striate cap margin. The skirt-like ring on the fruiting body on the left has been damaged by slug(s) or insect(s), but clearly preserved part of the internal limb of the universal veil on the bottom of the edge of the skirt. This eliminates species in the Phalloideae in which the internal limb does not detach from the membranous volva. Even if weather conditions might cause a membranous volva to break up into patches (I’ve seen this a few times) or cause striations to appear on the edge of a cap of a species that usually utterly lacks striations, I don’t think that having a bit of internal limb on the under side of the ring’s outer edge is a likely occurrence in sect. Phalloideae. For this reason, I think we should consider greatly reduced the possibility that this entity is A. ocreate.

So I’m with Christian on that point.


By: Christian (Christian Schwarz)
2010-11-13 13:38:31 MST (-0700)

A. ocreata does not have scale remnants from the universal veil.
Also, the stipe is usually longer, the partial veil is usually ragged and often disappears, and the volva is more sheathing. It grows with oak throughout its range.

Volva not right for a variety of A. muscaria
By: Richard Bishop (Leciman)
2010-09-28 23:34:05 MST (-0700)

I saw this specimen when it was fresh and there was no trace of the typical A. muscaria volva. Jan Lindgren (Amanita expert for Oregon Mycological Society) was shown this specimen and didn’t consider A. muscaria to be a possibility. I checked the spores and they are elliptical not globose an in var. alba. Spores that I checked were 9-12 × 6-8. I am presently drying this specimen and will give it to Jan Lindgren.—Leciman

It appears that I was looking at the wrong description when I made the previous comment about the spores. The spores are actually quite close to var. alba. Also I should mention that after showing Jan some pictures I had taken of this collection, she now thinks it may be A. muscararia. I’m going to try to add a couple of pictures to this observation.—Leciman

Created: 2010-09-26 22:36:26 MST (-0700)
Last modified: 2010-11-13 18:51:08 MST (-0700)
Viewed: 110 times, last viewed: 2017-06-07 22:39:06 MST (-0700)
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