Observation 32331: Amanita russuloides (Peck) Sacc.
When: 2009-09-21
No herbarium specimen

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There may be a third possibility…
By: R. E. Tulloss (ret)
2010-01-22 02:47:15 UTC (+0000)

Check

http://eticomm.net/~ret/amanita/key.dir/njpblist.html

and look at species 34 near the end of the listed species of sect. Amanita.

Essentially, the three possibilities (praecox, russuloides-S1 group, and species 34) each has a rather distinctive average spore shape (look at the bold Q’ values from the data in the two checklists I’ve cited). Careful spore measurement may help to pick a “winner.”

R.

About the spore print…
By: R. E. Tulloss (ret)
2010-01-22 02:38:36 UTC (+0000)

Hey, don’t call yourself names. I’m the only one allowed to do that. :-)

If you have the opportunity to measure the spores, it would be good if you could use the method that I use so you can compare your data to mine. I only measure spores that present themselves in lateral view. You can define this as the two ends of the spore are both in focus at the same time and the apiculus is also in focus. If the apiculus appears to be on the end of the spore then your looking at the spore in top or bottom view (unless you’re looking at the spores of a secotioid Amanita…and we don’t know of any in the Americas).

Many people don’t seem to worry about spore orientation and their data cannot be compared to Dr. Yang’s data or mine. This is a real shame. Someone will have to go over the types of all the species that were described without careful measurement. Unfortunately, that is altogether too many types for us to hope to get to in a life time.

Very best,

R.

You are very sharp, Rod
By: Eric Smith (esmith)
2010-01-21 22:38:31 UTC (+0000)

and I am dull…I posted this in haste before work this morning, and realized on my drive in that I’d posted the wrong date. I’ll change it though it’s only a couple weeks earlier.

Yes, that is an annulus collapsed up tight against the stem. You are also correct in saying that the cap isn’t darker in the center at all.

Yes, I do have a spore print, and oddly enough I have it labeled A. russuloides! Teaching myself to ID mushrooms seemed like a good idea at first, but sometimes it feels like I’m taxonomy’s worst nightmare!

Thanks for your help!

I’m not sure…
By: R. E. Tulloss (ret)
2010-01-21 16:18:57 UTC (+0000)

First, the duff is from pine, not hemlock. Second, the date of collection is rather late in the year.

[Is that an annulus on the stem?]

Third, the cap is not darkening in the center. This specimen might belong to one of the taxa with ellipsoid spores that are close to (or exactly) Amanita russuloides. See the pictures and descriptions of praecox and “species S1” on the following page:

http://www.eticomm.net/~ret/amanita/key.dir/am_gsmnp.html

There may be other possibilities. Did you happen to dry it or get a spore print? Spore information is present on the page cited above.

Very best,

R.

Created: 2010-01-21 11:02:30 UTC (+0000)
Last modified: 2013-07-07 01:00:29 UTC (+0000)
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