Observation 142596: Amanita sect. Vaginatae sensu Zhu L. Yang
When: 2013-08-13
No herbarium specimen

Notes: Under quaking aspen.

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From the previous post, it’s apparent that spore measurements would be…
By: R. E. Tulloss (ret)
2013-08-14 08:54:51 PDT (-0700)

useful in determining this material.

Very best,

Rod

This is the relevant part of the old western amanitas key. EDIT
By: R. E. Tulloss (ret)
2013-08-14 08:50:06 PDT (-0700)

I copied this from an old PDF and made minimal edits to the formatting after pasting the text here:

……………………………………………………

2. Pileus white, sometimes graying or otherwise discoloring with age.

::3. Spores with Q > 1.15.

::::4. Spores with Q > 1.35.

::::::5. Odor nauseating; reported from western Canada with Populus tremuloides…………………………………Amanita sp-ALB4
=Amanita roanokensis sensu Schalkwijk-Barendsen (1991) non Coker.

::::::5. Lacking nauseating odor; not reported with Populus.

::::::::6. Spores “8.8 – 13.3 × (8-) 8.4 – 9.2 (-10.2) μm,” with “Q = 1.41”; reported from southern California….“Amanita calyptrovelosa” G. Wright nom. prov.

::::::::6. Pileus surface dry and suggesting kid leather; spores (7.9-) 10.2 – 13.5 (-16.5) × (6.3-) 6.6 – 9.0 (-10.0) μm, with Q = 1.49 – 1.58; reported from Oregon with Corylus cornuta, Pseudotsuga menziesii, and Quercus garryana…………………………………………Amanita sp-NW9.

::::4. Spores (10.5-) 11.0 – 13.0 (-13.8) × (8.2-) 8.5 – 11.0 (-11.5) μm, with Q = 1.23; reported from Idaho in Populus tremuloides stand near Pinus…………………………………..Amanita sp. Cripps 331.

::3. Spores with Q ≤ 1.15.

::::7. Pileus not markedly discoloring with age; universal veil not graying with age.

::::::8. Universal veil as calyptra on pileus and rather robust saccate volva; spores [per Thiers (1982)] “9.5 – 12.0 × 9.5 – 11.5 μm,” with Q approx. 1.1; reported from California in hardwood (especially Quercus) and mixed forests………………………………Amanita alba sensu Thiers (1982)
non Pers. (= A. ovoidea (Bull. : Fr.) Link) non Thiers (=A. thiersii Bas). [Note: At least in part, this is a white variant (probably not
deserving of any taxonomic rank) of A. velosa, which see.

::::::8. Pileus with cream disc; universal veil having some remnants pulled up 50± mm by elongation of stipe; spores “9 – 11 μm,” with Q approx. 1; reported from Oregon……………………………………..Amanita sp. Collier 1.

::::7. Pileus discoloring with age.

::::::9. Pileus graying with age; universal veil graying with age, submembranous, often with strangulate region; spores “globose 10 – 14 μm,” with Q approx. 1; reported from Oregon…………..Amanita sp. Folsom 3.xi.1973.

::::::9. Pileus becoming brownish or rusty with age; universal veil discoloring similarly, fragile, often leaving patches or warts on pileus, often detaching from stipe and left as cup in substrate by collectors; spores (7.0-) 9.2 – 12.5 (-21) × (6.0-) 8.2 – 11.2 (-15.8) μm, with Q = (1.06-) 1.08 – 1.15 (-1.19); known from Kansas to Michigan in the east and Idaho to New Mexico in the west, occurring only with Populus spp..Amanita populiphila Tulloss & E. Moses.

…………………………………………………………

Very best,

Rod

Nope. It’s not in the list for AZ and NM.
By: R. E. Tulloss (ret)
2013-08-14 08:26:27 PDT (-0700)

For the information of our readers (hem hem) that checklist is here:

http://www.amanitaceae.org?US+-+AZ+and+NM

Dr. Alexander Smith recorded a number of white capped amanitas of section Vaginatae from the Pacific Northwest including Idaho and, as you may know, spent many season collecting in Idaho (at least part of the time); he also had some dedicated correspondents in Idaho such as Ellen Trueblood. The Univ. of Michigan has many collections colleted by, or sent to, Dr. Smith from Idaho…and I’m just referring to Amanita in this instance.

Hence, another place to look for ID is the old western amanita key that I made out of a mixture of sources including Dr. Smith’s notes. This key is quite outdated now, but may remain on the web somewhere. I’ll see if I can find it.

Very best,

Rod

Utah is my new diggs
By: Dan Molter (shroomydan)
2013-08-14 08:24:39 PDT (-0700)

Hey Rod,

After almost a year in Utah I finally found some good mushroom ground. I’m drying some of the possible A. veletipes you requested, but I left this big white vaginatea in the woods. I thought about collecting it, but it was too big and soggy to carry around all day. The stem on this guy was almost an inch in diameter.

This mushroom was found in an aspen grove.

Looks like your traveling, Dan.
By: R. E. Tulloss (ret)
2013-08-14 08:15:39 PDT (-0700)

this is an interesting specimen. I don’t think that this is A. populiphila, which is a possibility under Populus in North America. The cap shows now staining at all, and the volval sac seems rather robust. I think it might be covered in the checklist for Arizona and New Mexico, however. I’ll check there. Do you have a dryer with you? :)

Very best,

Rod

Created: 2013-08-13 21:06:19 PDT (-0700)
Last modified: 2013-08-13 21:22:29 PDT (-0700)
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