Observation 104710: Amanita Pers.
When: 2012-08-10
No herbarium specimen
0 Sequences

pictures from 3 consecutive days
mild odor
under Hemlock in yard —a white pine and a white oak within about 25’
cap 11 cm wide
KOH on cap negative
spore print white

Proposed Names

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Yes, thank you.
By: R. E. Tulloss (ret)
2012-08-16 05:46:19 PDT (-0700)

I received your packet of three collections several days back. I’m sorry not to have gotten back to you sooner. I’m swamped.


Partial veil comments
By: Steve Roberts (Mushroom World)
2012-08-15 21:42:32 PDT (-0700)

I didn’t make a note of the color of the partial veil when the specimen was collected. It was after the spore print when I made notes and observed the staining. Like you, from the photos, I see white. And from my memory, it was white when I worked it up (several hours later), except for the yellowish/brown stains that I believe occurred after collection.

I am unable to comment on the volval limb.

Also, I was hoping this one’s “sister” that was fruiting nearby would glean more information. Unfortunately, it turned out to be a dud. It’s in poor shape and the cap has never even opened -maybe it was the cooler weather that came through that put it to rest, I’m not sure.

I have the dried material, spore print, and completed worksheet set aside. I’ll mail it to you in the near future, as I’m sure other interesting material will surface that you’ll want to see. Did you receive my package with the A. cf jacksonii, A. cf cokeri, and the (China-bound) A. cf bisporigera?

Steve R.

By: R. E. Tulloss (ret)
2012-08-12 07:39:18 PDT (-0700)

Was the original color of the partial veil white or a yellowish or tannish cream? My impression from the photos is that it was white. Would you say that the volval limb on the bulb was standing up straight (not collapsing on stipe) for longer than the limb stands up without collapsing in A. bisporigera?

Ellipsoid spores, so far as is known (the information is imperfect) go with the dominantly ellipsoid spores. The group known to have these two characters includes A. elliptosperma and A. magnivelaris. In TN, from my experience, you are more likely to have elliptsosperma. There is a possibly distinct “numbered” species that might also occur in you region. I’m hoping to try to settle the latter issue sometime in the coming months.

Dried material from your observation(s) of this taxon would be very helpful.

Very best,


more details on the Amanita (possible) sect. Phalloideae
By: Steve Roberts (Mushroom World)
2012-08-11 20:01:00 PDT (-0700)

The partial veil stained yellowish-brown. I did not determine the thickness of the partial veil before drying.

Spores -ellipsoid to broadly ellipsoid: 9 – 11 × 6 – 8 um. Got a very insubstantial spore print, so didn’t check with Melzers. There is another specimen growing in the vicinity that is several days behind the subject specimen in development. After it matures, I can try to get a better spore print and check for amyloid reaction later if needed.

Amanita elliptosperma is an interesting suggestion.
By: R. E. Tulloss (ret)
2012-08-11 07:01:17 PDT (-0700)

There are a few other possibilities in eastern American species of sect. Phalloideae.

Can you tell us if the color of the partial veil changed over the period of time that you watched it? If “yes”, then from what color to what color? Also, did the partial veil appear to be thin like that of A. bisporigera or noticeably thicker and somewhat felted in appearance?

Do you have spore measurements? It seems probable that the spores would be dominantly ellipsoid and show an amyloid reaction to iodine.

This is an interesting collection because you the lack of KOH reaction on a relatively large fruiting body of something apparently in sect. Phalloideae and occurring in the eastern U.S. While we know of several taxa that that are in that grouping, there are several others for which the KOH reaction is unrecorded…which complicates matters.

Very best,


Created: 2012-08-10 22:12:32 PDT (-0700)
Last modified: 2012-08-15 21:45:24 PDT (-0700)
Viewed: 57 times, last viewed: 2017-06-13 09:22:08 PDT (-0700)
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