Observation 111570: Amanita polypyramis (Berk. & M.A. Curtis) Sacc.
When: 2012-09-28
No herbarium specimen

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A nice set of images, Sam.
By: R. E. Tulloss (ret)
2012-09-30 19:37:00 CDT (-0500)

R

I am finding these in lightly wooded areas
By: samh41@att.net
2012-09-30 17:37:45 CDT (-0500)

It has been wet over the past week on Cape Cod and these have proliferated in the past week. On emerging the cap is tight to the stem. Within a day or so the cap opens out to 4 to 6" across the bottom edges. There are frequently fragments of the veil on the ground under them. They are gilled. I’ve tried to include photos of most stages of their development. I have no particular background in mycology but my wife and I have been photographing mushrooms on the Cape and at home for the last three years.

I gather from your personal response that that the specimens…
By: R. E. Tulloss (ret)
2012-09-30 16:56:39 CDT (-0500)

with dome like caps have the circle made by their edges 4" across. These immature caps are certainly in the size range that I saw on Cape Code specimens of A. polypyramis.

R

Did you measure the 4" cap along the curvature of the surface?
By: R. E. Tulloss (ret)
2012-09-29 22:17:42 CDT (-0500)

or did you find a flat cap to measure across?
or did you measure across the bottom of convex cap?

The last picture (with all the small pointed warts on the cap) sure looks like polypyramis. I know it occurs on Cape Cod…when I saw it there in the nearly freezing rain of the NAMA foray a couple years back, local collectors said that they had been recognizing it for years. At the time, I thought it was strictly a mushroom of the SE US and Mesoamerica.

R

Big critters?
By: R. E. Tulloss (ret)
2012-09-29 15:05:07 CDT (-0500)

The button looks like a button of A. polypyramis.

I would expect the mature material to get rather large if that guess were to be correct.

R

It is very unlikely for names of species of other continents to appear in the U.S….
By: R. E. Tulloss (ret)
2012-09-29 15:02:27 CDT (-0500)

unless they are brought on the roots of their host plants. The species known to some as “A. persicina” in Australia is associated with Eucalyptus and other trees particular to the very dry SW of the continent.

R

I don’t think this can be “persicina.”
By: R. E. Tulloss (ret)
2012-09-29 14:58:26 CDT (-0500)

There are two species to which this name has been applied in Australia. One usage is rather common in the western part of the country and applies to a species of sect. Amanita; and one only existed in correspondence between Drs. Hilton and Bas (preserved in the herbarium in Leiden) and applied to a species of sect. Amidella.

This species doesn’t seem to fit with either of these concepts.

The name is not valid at present. The relevant species is now the subject of research by a group that I hope will publish soon.

R

Created: 2012-09-29 14:16:10 CDT (-0500)
Last modified: 2012-09-30 16:56:53 CDT (-0500)
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