Observation 140380: Amanita brunnescens G.F. Atk.

This gray Amanita sp. was collected near Oak and a Crab Apple tree in the Madelyn Marx Preserve in Kennebunk, Maine. The specimens stood about 15 cm tall and photos show morphological details. 20 Spore average is 8.9 × 7.8 microns with Q = 1.15. Intact spores are inamyloid in Melzers, but numerous ruptured spore fragments are clearly amyloid (see BF and DIC photomicrographs). The spores that were examined under the microscope were taken from a spore print (white) taken on glass.

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Thanks Herbert
By: Linas Kudzma (baravykas)
2013-10-27 02:12:16 GMT (+0000)

Yes, quite a variation in appearance from more “normal” others just a few miles away, which I have no DNA data on, but the micro is identical.

Nice work Linas
By: Erlon (Herbert Baker)
2013-10-27 01:19:33 GMT (+0000)

Just goes to show there is still much work to be done in understanding the wide morphological range of many species. The fruiting bodies of fungi are quite responsive to the micro-climate and are often more variable in their general shape and appearance than we give them credit for.

Any remaining debate is over …
By: Linas Kudzma (baravykas)
2013-10-27 01:47:37 BST (+0100)

100% ITS match to Rod Tulloss’s KC855217 in Genebank.

Regarding the importance of the basal structure…
By: Dave W (Dave W)
2013-07-21 03:48:07 BST (+0100)

perhaps the “star foot” trait is overemphasized.

Chances are very good that we shall eventually gain a better understanding of Amanita brunnescens. The quest for macro/molecular correlations is currently underway.

Your Obs 350712 looks a lot like this …
By: Linas Kudzma (baravykas)
2013-07-20 14:25:27 BST (+0100)

I still need to work up my other collections. When I do all the micro I’ll reach out to Rod to get his opinion.

I just ran across…
By: Dave W (Dave W)
2013-07-20 06:18:35 BST (+0100)

a bunch of A. brunnescens today that looked a lot like these. Some of the gray-capped amanitas showed the typical star-foot, and others in the same small patch did not. I’ll make a post.

I wasn’t sure about this one ..
By: Linas Kudzma (baravykas)
2013-07-19 14:20:49 BST (+0100)

that’s why I posted it. I collected others in Maine that are much more certainly brunnescens/ameribrunnescens. I’ll post more as I have time to do the micro. There were many, many Amanitas in Maine in early July. Amazing numbers and variety.

Also, those blue spore fragments are strange … has anyone seen this elsewhere?

Stipe bases each lack…
By: Dave W (Dave W)
2013-07-19 13:32:16 BST (+0100)

abrupt split bulb, which I believe is a defining macro-character for brunnescens.

Created: 2013-07-18 21:34:38 BST (+0100)
Last modified: 2013-10-27 07:43:42 GMT (+0000)
Viewed: 134 times, last viewed: 2017-12-21 17:31:37 GMT (+0000)
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