Observation 165246: Amanita sect. Phalloideae (Fr.) Singer

When: 2014-05-14

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

Who: Richard Kneal (bloodworm)

No specimen available



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pretty damp…
By: Richard Kneal (bloodworm)
2014-05-20 04:45:51 BST (+0100)

it was the morning after a good rain.

it also has …
By: Debbie Viess (amanitarita)
2014-05-20 04:04:36 BST (+0100)

an ever so slightly appendiculate margin.

how wet were field conditions?

By: Image Sharer (image sharer)
2014-05-20 02:39:05 BST (+0100)

Thank you Rod and Richard for your knowledge!

KOH solution
By: R. E. Tulloss (ret)
2014-05-19 15:14:12 BST (+0100)

You can get away with a lower percentage KOH solution for microscopy, and it will be less aggressive to the cell walls of cells you are examining. I use 2% KOH or less for microscopy. In the field 5-10% will work dramatically for macrochemical spot tests as shown in Richard’s pictures. Under 5% produces a slower and less well-defined reaction.

Remember that KOH solution absorbs carbon dioxide from the air and becomes more and more dilute with time due precipitation of potassium carbonate (that white powdery stuff in the bottom of your bottle).

Very best,


By: Richard Kneal (bloodworm)
2014-05-19 14:15:15 BST (+0100)

i generally use 10% in the field and 5% for microscopy…

By: Image Sharer (image sharer)
2014-05-19 12:42:14 BST (+0100)

What percent of KOH was your solution?

By: Richard Kneal (bloodworm)
2014-05-16 09:47:33 BST (+0100)

photo added…
i can send a collection, if you wish…

Yes, I caught the odd stem base.
By: R. E. Tulloss (ret)
2014-05-15 17:31:00 BST (+0100)

The yellow KOH reaction occurs with taxa other than bisporigera. These include “sp-O01,” “suballiacea,” and “virosiformis” (at least) in the east. Richard, could you give us some indication of the size of the fruiting body?


Good to see…
By: Josh M.K. (suchen)
2014-05-15 16:59:46 BST (+0100)

The Amanita are going off in Florida again! It has been slow for so long. The volva is super funky! Looks more like the “test tube” variety seen in section Amidella. Very cool.

The very extended limb of the volva is unusual for bisporigera.
By: R. E. Tulloss (ret)
2014-05-15 13:40:42 BST (+0100)

If you are able to dry material of this sort, I’d be very interested to examined it. That is a good shot of the yellow reaction to a strong base.

Very best,


Created: 2014-05-14 23:07:39 BST (+0100)
Last modified: 2014-05-20 04:05:17 BST (+0100)
Viewed: 102 times, last viewed: 2015-11-20 15:53:37 GMT (+0000)
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