Observation 66411: Amanita nigrescens G. Stev.

When: 2011-04-23

Collection location: Kaimanawa Forest Park, Taupo, New Zealand [Click for map]

Who: Michael W (Michael Wallace)

No specimen available

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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Very nice image!
By: R. E. Tulloss (ret)
2016-05-25 13:01:51 CDT (-0400)


great capture of those marginate gills, Michael.
By: Debbie Viess (amanitarita)
2016-05-25 11:33:55 CDT (-0400)

next trip, we are hitting NZ in May!

Thanks for the clarification, Randy.
By: R. E. Tulloss (ret)
2014-01-31 17:26:53 CST (-0500)

Amanitas are the only gilled fungi that develop in a solid lump and have to split apart in order to finish becoming a mushroom. Their gills always have to separate from a stem or an annulus or both. The other agarics have gills that grow from a small developing cap dowward into empty space and have a free bottom edge of the gill from the get go.

Very best,


Byrain is right
By: Randy Longnecker (Randy L.)
2014-01-31 16:56:48 CST (-0500)

I was referring to the black annulus, assuming black spores dropped on it. Very cool info about the “velcro” gills! I wasn’t aware of this.

Interesting discussion.
By: Dave W (Dave W)
2014-01-28 20:29:15 CST (-0500)

Beautiful photo. 96% confidence. What more may one ask in a MO observations?!

I can see that possibility. Good point.
By: R. E. Tulloss (ret)
2014-01-28 15:29:41 CST (-0500)

The source of the dark cells (the “velcro”) is the same in both cases.

Very best,


I think…
By: Byrain
2014-01-28 13:56:00 CST (-0500)

Randy meant the black pigments on the upper annulus, it kind of looks like a black spore deposit. :)

I think that if you have a black spore print, what you are seeing is the black inflated cells
By: R. E. Tulloss (ret)
2014-01-28 13:50:47 CST (-0500)

from the gill edge that have been left on the paper with the spore print. The tissue on the gill edges in Amanita serves a very specialized purpose…no other agaric needs such a thing. Because amanitas develop in a solid lump, there has to be some mechanisms be which the gills can separate from the stem…otherwise, they would be ripped to pieces. The gill edge tissue is sort of a single use velcro that allows the gills to gracefully separate from the stem. The raised lines on the top of an amanita’s stem and/or on the upper surface of an amanita’s annulus are composed of the same sort of cells (the opposite side of the single use velcro).

The cells in amanitas are sometimes not pure white, but the spores have never yet been found to be black (except under the scope in Melzer’s Reagent) in any Amanita.

Very best,


By: Randy Longnecker (Randy L.)
2014-01-27 23:11:12 CST (-0500)

This even has black spores? I never knew such a species of Amanita existed.

By: Britney Ramsey (Riverdweller)
2011-11-28 12:11:35 CST (-0500)

I’ve never seen something so intricate and beautiful!

Nice pic
By: R. E. Tulloss (ret)
2011-04-30 09:29:46 CDT (-0400)

A very nice grouping. I find the New Zealand Amanita species fascinating.

Very best,


Created: 2011-04-27 05:33:12 CDT (-0400)
Last modified: 2011-11-28 12:19:14 CST (-0500)
Viewed: 315 times, last viewed: 2018-10-08 14:10:11 CDT (-0400)
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