Observation 144573: Amanita verna (Bull. : Fr.) Lam.
When: 2013-06-12
No herbarium specimen

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If you able to obtain further material (this year or next),…
By: R. E. Tulloss (ret)
2013-09-04 14:58:03 PDT (-0700)

then I would be very interested in dried specimens. I have collaborated with academic laboratories in the past to obtain some DNA sequences from virosa and verna. It would be interesting to see if your material (reacting with KOH or not reacting with KOH) is similar to DNA we already have or is different.

If you look on the technical tabs of the two pages that I previously cited, you can click on the GenBank numbers in a data field near the top of the technical tabs and actually see the sequences that we have now for verna and virosa.

Very best,

Rod

You’re welcome, Davide.
By: R. E. Tulloss (ret)
2013-09-04 14:43:56 PDT (-0700)

R

I shoud add that…
By: R. E. Tulloss (ret)
2013-09-04 14:40:34 PDT (-0700)

the organizer of the French collecting and testing of A. verna was the late Francis Massart.

Very best,

Rod

oh i didn’t know that!
By: Davide Puddu (Davide Puddu)
2013-09-04 12:57:57 PDT (-0700)

I didn’t really know,thanks for sharing yout knowledge with me :)

Hello, again.
By: R. E. Tulloss (ret)
2013-09-04 12:41:27 PDT (-0700)

I have collected A. virosa in Norway and have several collections of A. verna from France. Over a couple of years, French collectors worked with me to test verna material from France with KOH; all the material reacted positively to KOH. As you know, virosa also reacts positively to KOH. Some years ago, I read reports of a non-reacting species from the Mediterranean area—something that looked like verna, but did not react to KOH. I have had such reports several times. The sources of the reports stated that they were certain that they were not testing white material of A. phalloides. They were testing a species with distinctly ellipsoid spores like those of A. verna. In one case, they said they had genetic evidence that the non-reactive, “verna-like” material was a distinct species.

In the case of this observation, I am interested in knowing whether you had the true verna that exists in northern Europe or the “new species” that is Mediterranean.

Very best,

Rod

hi Rod
By: Davide Puddu (Davide Puddu)
2013-09-04 11:11:46 PDT (-0700)

Amanita virosa is a mushroom i know and that i saw in the alps.it grows under coniferous trees and is much more irregular in the shape and the stipe has floccular ornamentations (a very bad smell too).these were taken under Quercus pubescens i’m 90% sure it is verna but next time i’ll try :)some specimen do pop out in october too even id this species grows tipically in spring

Hello, Davide.
By: R. E. Tulloss (ret)
2013-09-03 17:57:35 PDT (-0700)

Did you try placing a drop of KOH solution on the cap or stem? Supposedly, there is a Mediterranean species that does not react with KOH whereas virosa and verna (contrary to many field guides) DO react with KOH.

Links:

http://www.amanitaceae.org?Amanita+verna

http://www.amanitaceae.org?Amanita+virosa

Very best,

Rod

Created: 2013-09-03 16:56:09 PDT (-0700)
Last modified: 2013-09-04 14:44:17 PDT (-0700)
Viewed: 73 times, last viewed: 2016-10-27 02:04:21 PDT (-0700)
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