Observation 65504: Amanita farinosa sensu auct. Pacific Northwest states
When: 2010-09-17
Herbarium specimen reported

Proposed Names

81% (1)
Recognized by sight: The drawings plus the photos are nice documentation.

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very nice, A and O!
By: Debbie Viess (amanitarita)
2011-04-15 08:13:37 PDT (-0700)

I can see the similarities with the eastern farinosa…

Re: very nice documentation
By: Oluna & Adolf Ceska (aceska@telus.net)
2011-04-15 00:31:38 PDT (-0700)

Thanks for your comment, Rod. We are going to post more Amanita puzzles for you on MO. Adolf liked taxacom before it became too abstract. O+A

Pacific Northwest states
By: Oluna & Adolf Ceska (aceska@telus.net)
2011-04-15 00:22:19 PDT (-0700)

Drop the “states” and even British Columbia will be happy. Unless you want to use the earliest used name “The Hudson Bay Oregon Territory”. Adolf

Nathan, if you read this…
By: R. E. Tulloss (ret)
2011-04-14 05:28:19 PDT (-0700)


I think it would be appropriate to remove “states” from the temporary name used on MO for this entity. Obviously, it occurs in a “province,” too. :-)


Very nice documentation…
By: R. E. Tulloss (ret)
2011-04-14 05:24:17 PDT (-0700)

This taxon is distinct from A. farinosa (described from the Atlantic Coastal states of the U.S.) and is treated on www.amanitaceae.org under the moniker Amanita farinosa sensu Thiers:


There are many similarities between the two N. American taxa, which are undoubtedly related.

The marginal cells on Amanita lamellae are not cystidia.  they are part of a uniform tissue that permits the separation of the amanita lamellae from the stipe (in the present case) or the partial veil. Such a structure is requisite in the unique mode of development of the Amanita fruiting body (so-called schizohymenial ontogeny).

There is relevant discussion on this topic in the “About” pages (accessed via the blue navigation bars on the left side of the home page of www.amanitaceae.org. A discussion of the word “cystidia” in relation to the marginal cells of amanita gills can be found here:


Another interesting thing about the taxa similar to A. farinosa is that they have a pileipellis that only gelatinizes after considerable delay. The powdery volva actually remains connected to the pileipellis for a considerable length of time (even a light rain will not wash it all off) after sporulation is well under way. This characteristic is shared by a few other amanitas of section Amanita, which appear to belong to a distinct group within the section. A provisional systematics for section Amanita is built into www.amanitaceae.org .

The supposed closest relatives of A. farinosa are placed in the informal Amanita stirps Farinosa; this groups is proposed to fall within a “series Farinosae,” etc.

Since I have never examined material of this species from British Colombia, I would very much like to see the herbarium material you have retained from your collection.

Thank you for the post. The drawing really attracted my attention. I appreciate the work that went into creating it.

Very best,

Rod Tulloss

P.S. Do I recognize Adolf’s name from taxacom?

Created: 2011-04-14 01:16:18 PDT (-0700)
Last modified: 2011-04-14 05:01:32 PDT (-0700)
Viewed: 119 times, last viewed: 2016-10-22 00:01:33 PDT (-0700)
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