When: 2018-09-11

Collection location: Mill Pond, Farwell, Michigan, USA [Click for map]

Who: Heather Waterman (ripkord)

No specimen available

Notes:
Found fruiting from soil in mixed hardwood/conifer forest.

Images

Proposed Names

28% (1)
Recognized by sight
28% (1)
Recognized by sight: See Rod’s comments.

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= Observer’s choice
= Current consensus

Comments

Add Comment
You’re welcome, Heather.
By: R. E. Tulloss (ret)
2019-03-23 00:57:42 EDT (-0400)

R

Thanks for the info
By: I. G. Safonov (IGSafonov)
2019-03-23 00:13:38 EDT (-0400)

Yep, I would bet (with caution) they are the same. :-)

I should have taken a pic of them in situ!
By: Heather Waterman (ripkord)
2019-03-23 00:07:14 EDT (-0400)

I do recall they were within 5-7 feet of each other. I don’t have enough experience with Amanita to speak to variables affecting appearance with maturity. Your comments are helpful for future encounters with the genus!

Maybe same species after all…
By: I. G. Safonov (IGSafonov)
2019-03-22 20:26:57 EDT (-0400)

…despite the difference in pigmentation, especially if these were found near each other. This is also suggested by the size, shape and the structure of the stipital volva. Is it possible that the cap color is age-dependent or subject to change by weather conditions or exposure to the sun?

Rod, thank you for your very thoughtful and helpful comments!
By: Heather Waterman (ripkord)
2019-03-22 19:58:22 EDT (-0400)
Beautiful specimens.
By: R. E. Tulloss (ret)
2019-03-18 10:08:44 EDT (-0400)

I think you have two distinct species…one white and the other brownish gray. The habit and cap color are not enough to determine these to species. We know that the relatively robust volva that does not turn gray with age eliminates the species of the group listed here:

www.amanitaceae.org?series%20Ceciliae

Dried material is critical in determining section Vaginatae. Spore measurements help in cases in which the average spore is not globose or subglobose. The ratio of marginal striation length to pileus radius (measured with a flexible ruler along the cap surface!) can be useful. DNA is very useful because of the large number of sequences posted in GenBank derived from material from largely from China (e.g., with Index Herbariorum designation HKAS) and from the (largely) North American collections in the Roosevelt collection (with Index Herbariorum code RET).

I see that no dried material was retained in association with this observation.

Very best,

Rod Tulloss