Observation 49436: Amanita Pers. sect. Amanita
When: 2010-08-01
No herbarium specimen

Proposed Names

28% (1)
Recognized by sight
81% (1)
Recognized by sight: Apparently, a pantherinoid species. R.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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Do you have iodine?
By: R. E. Tulloss (ret)
2010-08-01 09:37:04 PDT (-0700)

In determining amanitas you can determine the subgenus by taking a spore print on a nonreactive surface (glass or glazed potter). In gathering the spore print you can reduce confusion of spores with cells that may be on the edges of gills by positioning the cap so that the gill edges don’t touch the surface on which the spores are to fall. When a sport print has accumulated, push the spores together so that you have a very distinct white lump of spores.

Then if you have tincture of iodine, you can put a single drop on the pile of spores. To see the sort of color you should expect from the spores (if they are AMYLOID) you can try a drop of iodine on a piece of potato). If the AMYLOID reaction occurs on the potato or the spores you should get a dark blue (even black) reaction. If the AMYLOID reaction DOES NOT occur, the pile of spores will simply take on the color of the iodine solution and NOT turn dark blue or black.

The reason for using glass or glazed pottery is that many surface on which spores might be collected (paper, wood, etc.) may react positively to iodine. Also, glass and glazed pottery can be washed and re-used and will not take on a permanent stain from the iodine.

I expect that you will NOT get an AMYLOID reaction from a pantherinoid taxon. Such taxa are in the subgenus Amanita which is DEFINED by it’s having inamyloid (i.e., NOT amyloid) spores.

When I have an opportunity, I will see if I have a record of the species seen in your photographs…or something like it from India. There are several pantherinoid taxa which could very well occur in your region.

Very best,


Created: 2010-08-01 09:15:11 PDT (-0700)
Last modified: 2012-06-06 13:28:06 PDT (-0700)
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