Observation 91736: Amanita sect. Vaginatae sensu Zhu L. Yang
When: 2010-08-15
No herbarium specimen

Notes: Voucher Number: NAMA 2010-075

Amanita [A. stannea A.H. Sm. nom. prov.]
Identified by: Cathy L. Cripps
Collected by: Angie Miller

Voucher Specimens are located at the Botany Herbarium,
Field Museum of Natural History, Chicago.

Proposed Names

55% (3)
Eye3
Recognized by sight
55% (1)
Recognized by sight: an uncommonly collected Rocky Mt. species of grisette with a pale silvery gray cap, flat patches/warts and a reddening volva.
Used references: Bob Chapman, others

Please login to propose your own names and vote on existing names.

Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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The Wyoming photograph of Dr. Smith is now posted on…
By: R. E. Tulloss (ret)
2015-09-09 14:13:24 EDT (-0400)

the WAO webpage for “stannea.”

The photograph is the property of the Regents of the University of Michigan and was used with their permission.

The length of the marginal striations in this photo certainly get up into the 35%-of-radius range—-as Smith mentioned in his notes on Colorado collections which form the source of the descriptive text that Smith created for “stannea.”

Smith’s text (converted to modern notation where necessary), spore, measurements, and (now) the Wyoming photo are here:

http://www.amanitaceae.org%20stannea

It is still necessary to demonstrate as thoroughly as possible that the photographed collection and the collections with written descriptions are contaxic.

Very best,

Rod

I have now seen Dr. Smith’s photographs of a collection he placed…
By: R. E. Tulloss (ret)
2015-09-08 14:41:11 EDT (-0400)

in A.stannea” in his Amanita notes. The image is from his collection no. 35466 and was found filed under “vaginata.” Patricia Rogers at the MICH herbarium is to be credited with finding the images. Another super-sleuthing job on her part. The general form of the specimen in the two photographs is quite similar to the form of the mushrooms in this observation. It is a monochrome (B&W) photo.

It appears that the fibers on the stipe (forming a zebroid of flame or snakeskin pattern on the upper half of the stipe) are quite a bit darker in the Smith photographs than is seen in the images of this observation. In some species the amount of pigment on the stipe decoration can vary…or not.

The photo is from a Wyoming collection for which Smith created no written description. Also, this collection predates Smith’s start of using the name “stannea.”

So we have another clue.

I will attempt to borrow all Smith’s material of A. “stannea.” At the very least, this will improve the treatment on the WAO website.

Very best,

Rod

Further information has become available …EDITED
By: R. E. Tulloss (ret)
2015-09-02 21:51:06 EDT (-0400)

Thanks to Patricia Rogers at the MICH herbarium, I’ve now seen the original field notes that exist for Amanita stannea and have changed the WAO page to show which specimens (from Colorado and now shown in black text on the web page) are the basis of Smith’s manuscript description. The other collections are now shown in olive text.

Very best,

Rod

Smith makes no mention of the volva becoming reddish.
By: R. E. Tulloss (ret)
2015-09-01 16:19:58 EDT (-0400)

He says it can become sort of dirty ochraceous.

Very best,

Rod

Dr. Smith’s Ms. description of the species is now posted on WAO.
By: R. E. Tulloss (ret)
2015-09-01 16:18:23 EDT (-0400)

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