Observation 86291: Amanita Pers.

When: 2012-01-14

Collection location: Gainesville, Florida, USA [Click for map]

Who: Richard Kneal (bloodworm)

Specimen available



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Add Comment
almost certain…
By: Richard Kneal (bloodworm)
2012-04-18 20:57:33 CDT (-0400)

the other specimen i have available is observation 86875.
let me know what you think.

thanks again.

another specimen available…
By: Richard Kneal (bloodworm)
2012-04-18 20:29:04 CDT (-0400)

ret, i have another specimen with a distinctly marginate bulb in tact.
unfortunately, i did not keep track of the observation #, but i think i can figure it out.
i can have the specimen shipped out tomorrow if you would like to compare microscopy.
i am excited about this.
let me know.


If this is not identifiable, …
By: R. E. Tulloss (ret)
2012-04-18 18:43:15 CDT (-0400)

it is very distinctive and should get a code number. But I just can’t believe that Murrill would not have just sucked this one up and published it!


Further report of limited progress…
By: R. E. Tulloss (ret)
2012-04-18 18:38:59 CDT (-0400)


We think that this may be the same taxon as your observation 86287.

This would mean that there was a distinctly marginate bulb of which we have no representative material in the present specimen.

Cristina checked the subhymenium and it is cellular, which would be consistent with either sect. Phalloideae or sect. Validae. Bright yellow on the upper surface of the partial veil and on the edges of the lamellae is not a character that one sees much in sect. Phalloideae (can’t think of a single instance). The bulb in 86287 appears distinctly marginate at least on one side. This suggests a taxon similar to A. bulbosa and A. citrina f. lavendula. There is a species that Murrill called “mappa” var. “tenuipes” for which we have very little information. We’ll see if there is something that we could put on the WAO site. Jenkins reported on a type study of this mushroom, but it very brief and doesn’t mention any bright yellow on the stipe or partial veil.

Right now we’re stuck.

R & C

Some progress by Cristina… [edit]
By: R. E. Tulloss (ret)
2012-04-18 16:26:58 CDT (-0400)

The spores are amyloid and the distribution of length indicates that we have a mature basidiome with spores that are probably typical of the species. Clamps are absent from the basidia. Nothing Cristina found would eliminate sect. Validae, which I still favor as the right section.

My guess was that this would be A. flavivolva. No way. The spores Cristina measured are too round [Q = (1.07-) 1.08 – 1.32 (-1.35)]. We’re going through Murrill’s species of sect. Validae by brute force at the moment. Jenkins’ article on Murrill’s types has very abbreviated data for spores, and we are going to have to ask for the types of several taxa from FLAS (contact already established).

We can’t be sure if the existing spore measurements in the literature were made using our methodology. They certainly seem too perfectly globose for some species (e.g., A. maculans, which would have shown red-staining if that was what you had).

We’re in discussion of what to do next…more brute force….


By: Richard Kneal (bloodworm)
2012-04-11 15:39:31 CDT (-0400)

the description you asked for can be found here:

thanks ret…
By: Richard Kneal (bloodworm)
2012-04-11 12:21:07 CDT (-0400)

can’t wait to see the workup…
thanks again.

Material arrived
By: R. E. Tulloss (ret)
2012-04-11 12:02:37 CDT (-0400)

Thank you.

Nice packing job. :-)


shoot me your address…
By: Richard Kneal (bloodworm)
2012-01-17 04:10:04 CST (-0500)

i will have the specimen sent out ASAP.

I’ll volunteer… [edited]
By: R. E. Tulloss (ret)
2012-01-15 23:52:21 CST (-0500)

Either Cristina or I will take a look.

It is indeed a curious critter.

I should add that since neither of the two groups I previously listed contain any (reported) taxa that stain yellow or have a yellow upper stipe, I’m still thinking that the yellow on the fruiting bodies in the present case and in your previous post may be attributable to the “yellowing syndrome.” This pops up in a number of places on WAO. Off the top of my head, I remember the discussion here:


because that was the first species for which it became clear to me that the yellowing seemed to not be determined by the genome of the amanita, but was the result of some sort of action ON the amanita.

Very best,


i do.
By: Richard Kneal (bloodworm)
2012-01-15 19:04:42 CST (-0500)

ret or debbie want to take a look?
my scope is coming in on tuesday but i would rather someone else look at it.

still have that specimen?
By: Debbie Viess (amanitarita)
2012-01-15 18:26:50 CST (-0500)

hope you dried it…this is a very curious amanita…not sect. vaginatae (it has an obvious annulus), weird, almost flocculent-appearing volva…
definitely worth a harder, closer look.

cool find!

Since the stipe base came away with volval remnants…
By: R. E. Tulloss (ret)
2012-01-15 13:12:21 CST (-0500)

could there have been a bulb that decayed?

The fact that the margin of the cap is completely without striations is inconsistent with a saccate volva. I could see what appears to be part of a patch on the pileus, and I don’t see any volval remains that would look like the inside layer of a volva in sect. Amidella. No marginal striations (not even a tiny bit) seems to eliminate sects. Caesareae and Vaginatae. This leaves species with membranous, stipe-encircling, limbate volvas. Hence, we’re in the neighborhood of the mushroom in your earlier post—-either sect. Phalloideae or subsect. Limbatulae (in sect. Lepidella). Of course, I may be missing something…?


no bulb…
By: Richard Kneal (bloodworm)
2012-01-15 01:05:39 CST (-0500)

saccate volva (assuming) around a slightly tapered stipe.
pictures show volva remains.

By: R. E. Tulloss (ret)
2012-01-14 17:52:25 CST (-0500)

Yellow upper stipe and yellow gill edges. I can’t really tell what the bulb was like. Is this the same species as the one in the previous set of pix with the limbate volva on a big bulb. Please tell us about the bulb in this one.


Created: 2012-01-14 16:23:39 CST (-0500)
Last modified: 2018-01-01 15:55:53 CST (-0500)
Viewed: 241 times, last viewed: 2018-01-01 20:59:24 CST (-0500)
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