Observation 82949: Amanita xylinivolva Tulloss, Ovrebo & Halling
When: 2011-08-31
No herbarium specimen

Notes: On display at the Senguio Fungus Fair.

Proposed Names

31% (2)
Recognized by sight
49% (2)
Eye3
Used references: Rod Tulloss
Based on microscopic features
6% (2)
Recognized by sight
Based on chemical features: DNA from other Mexican A. xylinivolva collections matches Amanita stranella
58% (1)
Eye3 Eyes3
Based on microscopic features: Spores subglobose

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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Amanita stranella
By: R. E. Tulloss (ret)
2012-01-19 08:48:09 PST (-0800)

I have updated the taxon page for A. stranella at

http://www.amanitaceae.org?Amanita+stranella

The species received a very brief description based on a holotype (now lost) and a watercolor (now lost). Only one specimen exists from Dr. Snell’s collection of the period prior to publication of the species…this is the only known candidate for a lectotype. The question of what lectotypification would do to make the species understandable is an open one at present…as far as I am concerned.

Given the characteristics laid out in the original description and the results of brief study of the potential lectotype material that I did in 2006, the only possibility that we know this taxon under another name is represented by Yves Lamoureux’s provision A. praecox. However, the cap colors are not a terribly good match to the cap colors of the original description of stranella.

Microscopy will probably be the only way of deciding the issue. That is going to take some time.

With regard to collections to which the name A. xylinivolva has been applied in Mexico and Central America, I think there is more than one thing going under that name; and, from personal experience, the taxa are not easy to segregate with the naked eye. I have collected material in central Mexico and in the Cordillera Talamanca, Costa Rica, that came home from the field with “xylinivolva” on them, but ended up as unknowns.

I decided to withdraw my suggestion of xylinivolva as a name in the present case.

R.

Created: 2011-11-21 09:01:20 PST (-0800)
Last modified: 2012-09-25 11:39:57 PDT (-0700)
Viewed: 67 times, last viewed: 2016-03-31 07:26:17 PDT (-0700)
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