Observation 50130: Amanita augusta Bojantchev & R.M. Davis

When: 2010-08-10

Collection location: Mendocino, California, USA [Click for map]

Who: Ryane Snow (snowman)

No specimen available



Proposed Names

-18% (5)
Recognized by sight: found in mixed conifer forest <1 mile inland
40% (3)
Recognized by sight
64% (4)
Recognized by sight: it may be an old one. yellowish partial veil
Based on microscopic features: looking at the spores again, there may be an amyloid reaction, which is somewhat difficult to ascertain with Amanitas

Please login to propose your own names and vote on existing names.

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
You’re very welcome
By: R. E. Tulloss (ret)
2010-08-15 11:21:20 EDT (-0400)

This observation provided a good learning opportunity that ranged over both macroscopic and microscopic charactters. Good stuff.

Very best,


spores are weakly amyloid
By: Ryane Snow (snowman)
2010-08-15 11:05:40 EDT (-0400)

re-examination of the spores indicated a weak amyloid reaction, which would further the evidence for A. franchetii. Thanks for all your help Rod.

That’s an interesting suggestion.
By: R. E. Tulloss (ret)
2010-08-14 01:09:10 EDT (-0400)

It means you have to review your reading of the spores as inamyloid; however.

Do you still have the slide? If so, look for spores that are clumped together or are lying on some basidia (to give a contrasting background). These are two ways to detect a weak amyloid reaction in spores.

Very best,


Ah. Too bad.
By: R. E. Tulloss (ret)
2010-08-12 16:59:37 EDT (-0400)

Well, I think we can eliminate the Eurasian A. pantherina, but I don’t think this is A. ameripanthera either.


partial veil is slightly yellow
By: Ryane Snow (snowman)
2010-08-12 12:35:16 EDT (-0400)

This mushroom was found 2 days ago in Mendocino. No rings of yellow volva. Unfortunately I tossed the cap so I am not able to see if there are clamps at the bases of the basidia.

By: R. E. Tulloss (ret)
2010-08-11 23:10:04 EDT (-0400)

Was I right about the colors of the partial veil and the rings of volva? Or is that an artifact of the photograph?

Do you have the time to see if there are clamps at the bases of basidia?

This is an August 2010 mushroom from Mendocino, right? :-)



spores are inamyloid
By: Ryane Snow (snowman)
2010-08-11 22:54:00 EDT (-0400)

I returned to where I found the mushroom and was able to retrieve the photographed
specimen. Spores were inamyloid.

It seems to me the partial veil is yellow…
By: R. E. Tulloss (ret)
2010-08-11 10:25:49 EDT (-0400)

and that there are two rings of yellow volva low on the stipe above the bulb. Is the specimen still around? Could you check to see if the spores are amyloid or inamyloid?


Created: 2010-08-11 02:34:42 EDT (-0400)
Last modified: 2014-11-06 16:39:07 EST (-0500)
Viewed: 143 times, last viewed: 2018-07-16 12:30:09 EDT (-0400)
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