Observation 34126: Amanita vaginata var. alba Gillet
When: 2007-07-10
No herbarium specimen

Notes: A very common local tall, slender Amanita with brilliant white cap (sometimes with discolored small umbo) appearing early in summer under birch (Betula pendula).
Two issues with it: a) I sometimes come across specimens with visible grayish tinge, i.e. the center and striations on cap edge are grayish, yet not gray enough for what looks like A. vaginata and also grows here.
b)visually identical white Amanitas (a bit more petite, perhaps) sometimes grow under pine (Pinus sylvestris) in pine-only forest. The question is whether such host diversity is normal or they need a closer look at them.

P.S. not sure that “sensu N. Amer authors” that’s been automatically added really works for these….

Images

79475
79476
taken 2 weeks later than the one above;
79477
This photo from 2006 illustrates what I wrote about grayish-tinged specimens.
The “true” gray ones (A. vaginata) do get paler with age but they tend to stay more or less gray and also get brownish blotches – and these grayish-white ones don’t.
This is so messed up!! %@

Proposed Names

ret
54% (1)
Eyes3
Recognized by sight: I’m not saying I’m certain about this ID, I just wanted a name to be available for the European taxon.

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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If these specimens were very much larger than usual “vaginata” and
By: R. E. Tulloss (ret)
2010-02-26 07:13:23 CST (-0500)

had a densely floccose sheath at the top of the stem (several cm long), then a determination of Amanita islandica would be more likely to be correct. The latter species is also known with birch from Iceland (to which it was probably imported with birch) to Norway and Sweden. There’s no reason I know why islandica would not occur further east.

Very best,

Rod

Created: 2010-02-26 03:21:33 CST (-0500)
Last modified: 2010-02-26 03:21:33 CST (-0500)
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