Observation 176994: Amanita Pers.

When: 2014-08-24

Collection location: Murdock Basin, Uinta National Forest, Utah, USA [Click for map]

Who: Dan Molter (shroomydan)

No specimen available


Proposed Names

86% (1)
Recognized by sight

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= Observer’s choice
= Current consensus


Add Comment
By: R. E. Tulloss (ret)
2014-09-09 07:32:19 CDT (-0400)

I looked at the images again. I hadn’t noticed the striate cap margin. Also, I hadn’t noticed the squarely cut off (truncate) short gills, which appear to be plentiful and of diverse lengths. In addition, the cap seems likely to have a gelatinizing surface (common in amanitas) because the warts have slipped over the edge of the cap in several places.

Sometimes, striate cap margin and truncate lamellulae may indicate that the spores of the amanita will not be amyloid. This is not a hard and fast rule as some authors thought in the first third or half of the 20th Century. For example, sect. Amidella contains numerous exceptions; and there is a species of the Validae in Africa with a striate cap margin.

Anyway, the unknown interests me.

Very best,


The white color (maybe because I have collected so much in the southeastern US)…
By: R. E. Tulloss (ret)
2014-09-09 07:23:12 CDT (-0400)

always suggests sect. Lepidella to me…at least at first. But the very smooth edge of the cap shows no appendiculate material. The partial veil seems like it may be thicker than usual…causing it to fall against the stem in an odd manner…its tissue is strong enough to hold it together, but weak enough for it to split…also, it seems to have curled up…as though the underside dried faster than the top side. These observations suggest that the partial veil might be adapted to a dry climate. There seems to be a lot of volval material on the underside of the partial veil at the edge.

The lower stipe seems rather strongly striate…like the so-called “strangulate” region at the bottom of the stipe in species like A. ceciliae of section Vaginatae. I don’t recall that appearance on the fleshier taxa with a bulb at the base.

The densely set pyramidal warts on the cap seem to be pigmented. My guess is that this is some sort of color change due to age and/or exposure after expansion in sunlight, etc.

I am uncertain as to which section might be home to the species. Of course, Melzer’s reagent will get one started on that matter.

Finally, I’m fairly confident that I’ve never seen the species before.

Very best,


What makes this one worth a second look?
By: Dan Molter (shroomydan)
2014-09-09 03:19:14 CDT (-0400)

Hi Rod,

Can you tell us what makes this specimen interesting from a taxonomic perspective? With Amanitas here in Utah, I see combinations of characters which seem quite different from familiar mushrooms from Ohio, and from mushrooms I often see posted from California.

I’d like to know what about this specimen piqued your interest.

Many thanks, Dan.
By: R. E. Tulloss (ret)
2014-09-05 18:21:24 CDT (-0400)

Very best,


Hi Rod
By: Dan Molter (shroomydan)
2014-09-05 13:54:04 CDT (-0400)

If I see one like this again I will collect it and send it your way.

Hello, Dan.
By: R. E. Tulloss (ret)
2014-09-05 13:33:55 CDT (-0400)

I took a little time to look at the photos at highes magnification.

If you have a chance to collect this, I’d be very interested in seeing dried material.

Very best,


Very interesting pictures, Dan.
By: R. E. Tulloss (ret)
2014-09-05 13:31:22 CDT (-0400)

Very best,

Rod Tulloss