Observation 109767: Amanita “sp-W15” Tulloss cryptonom. temp.
When: 2012-09-15
Herbarium specimen reported

Notes: [36,1,1] 7.8-9.2 (9.4) x 5.3-6.0
Q = 1.40 – 1.60
L’ = 8.5
W’ = 5.7
Q’ = 1.50

Proposed Names

4% (2)
Recognized by sight
54% (1)
Recognized by sight
81% (1)
Based on chemical features: One of the specimens on which generic segregation of the new taxon is based.

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

Eye3 = Observer’s choice
Eyes3 = Current consensus


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Same new species as in observation 107636.
By: R. E. Tulloss (ret)
2015-08-06 22:13:00 CEST (+0200)

Again per Santiago’s molecular work as well as no orange felted patches on stem and narrow spores.

Very best,


Low and away, again.
By: R. E. Tulloss (ret)
2013-05-29 18:34:27 CEST (+0200)

From a righthand batter from the pitcher’s point of view.

Could be “sp-AR01.” It’s not jacksonii because of the relatively high Q values that you report. Otherwise, the sporograph was not very enlightening.

Very best,


Thank you, Steve.
By: R. E. Tulloss (ret)
2013-05-29 18:27:33 CEST (+0200)

This material is accessioned and scheduled for sampling.

I think I did it before, but I’ll run a sporograph comparison of this with a couple of species. I think it looks a lot like “sp-AR01.” I’ll send you the image to post here if you want to do that.

Very best,


That’s great, Stephen.
By: R. E. Tulloss (ret)
2012-09-18 02:37:40 CEST (+0200)

It’s really very kind of you.

Thank you.


I did double-checked my calibration
By: Stephen Russell (Mycota)
2012-09-18 00:14:48 CEST (+0200)

And it does seem to be pretty accurate. My microscope is attached to my computer screen, and I can click to do measurements on the screen. It is a pretty fast process. With a 10 micron measurement, I would not expect more than 1-2% error. Obviously greater percentage as the size decreases.

Ive got a big box of Indiana Amanita
By: Stephen Russell (Mycota)
2012-09-17 23:54:53 CEST (+0200)

to send your way. Several collections of this. Ill probably send them when the season is over.

I started looking through some of the numbered taxa.
By: R. E. Tulloss (ret)
2012-09-17 23:51:41 CEST (+0200)

Amanita sp-N12 has similarly shaped spores, but my size measurements are greater than yours. Amanita sp-F11 appears to have bigger, narrower spores.



Thanks for the spore data.
By: R. E. Tulloss (ret)
2012-09-17 23:24:47 CEST (+0200)

Great. The average Q is significantly higher than that for A. jacksonii. We now can list cap pigmentation, stipe decoration, and spore size/shape as differentiating characters. By Bas’ rule of thumb, the material of this observation is a different species from A. jacksonii (three unrelated differences).

Now the question is “Have I seen it before and given it a number?”


Updated with spore data.
By: Stephen Russell (Mycota)
2012-09-17 22:46:17 CEST (+0200)

Spores a little narrower with a larger Q than jacksonii.

Ive just been putting them all as jacksonii
By: Stephen Russell (Mycota)
2012-09-16 17:01:59 CEST (+0200)

until i have a better name to update them. Ill get you some spore measurements later today.

Don’t think this is jacksonii.
By: R. E. Tulloss (ret)
2012-09-16 16:12:21 CEST (+0200)

No orange-felted material on the stipe; margin of cap too yellow too soon.

Very best,


Created: 2012-09-16 02:46:02 CEST (+0200)
Last modified: 2015-08-06 23:16:08 CEST (+0200)
Viewed: 117 times, last viewed: 2016-10-21 16:00:01 CEST (+0200)
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