Observation 68529: Amanita sect. Vaginatae sensu Zhu L. Yang
When: 2011-06-01
No herbarium specimen

Notes: 7cm across cap, 14cm long stem, white spore print, growing on ground under oak tree in mixed forest

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Eye3 = Observer’s choice
Eyes3 = Current consensus

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Most excellent…
By: R. E. Tulloss (ret)
2011-06-02 08:14:32 HDT (-0900)

Glad you saw that.

You probably also noticed that when the you sliced through the developing stem its for suggested a pair of narrow parentheses…that is…that the bottoms of the two sides of the stem were slightly pointed toward each other and that there was no bulb…just volva below the bottom of the stem. This fits with the definition of the “totally elongating stem” which is the fundamental way in which sections Vaginatae and Caesareae are segregated from section Amanita. We’re not always so lucky as to have a button to check out.

Very best,

Rod

Stem Ring
By: Brian Adamo (adamo588)
2011-06-02 07:47:31 HDT (-0900)

Right on, Rod. Your conclusion that the ring on the lower stem is the remains of an inner connecting limb of the volva is borne out by my observation of the cross-section of that little button (shown growing next to the mature specimen in the top picture). Sorry I didn’t take any photos of that.

No specimen?
By: R. E. Tulloss (ret)
2011-06-02 05:20:16 HDT (-0900)

I can see why there is a disagreement on sectional placement. At the highest magnification, the ring on the lower stem looks as though it could be an annulus or the internal limb of the volva. In my experience, I’d say that the stipe is totally elongating (that’s an educated guess). If that guess is correct, then the choice would be between section Vaginatae and Caesareae. I have never seen a North American species of the Caesareae with a friable volva leaving warts or little patches on the volva as can be seen in Brian’s photo of the top of the cap.

So, I’m going to vote for section Vaginatae, which means I’ll have to conclude that the ring on the lower stem is the remains of the inner limb of the volva (the tissue that was once between the bottom of the gills and the stem in developing “button” of this mushroom).

Very best,

Rod

Created: 2011-06-01 12:58:34 HDT (-0900)
Last modified: 2011-06-02 05:20:34 HDT (-0900)
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