Observation 111662: Amanita bulbosa (Schaeff.) Lam.
When: 2012-09-30
Collection location: Celje, Slovenia [Click for map]
(46.0° 15.0° 400m)
Who: seadragon
No herbarium specimen

Notes: the amanita has a light yellow cap and annulus

Proposed Names

-6% (2)
Recognized by sight
8% (2)
Recognized by sight: Cap and ring are light yellow according to the collector (I think it is not showing well on the photos).

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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You’re welcome.
By: R. E. Tulloss (ret)
2012-09-30 17:35:09 PDT (-0700)

If you don’t hear from me before Thanksgiving, poke me with an email.

R

Thanks for your reply.
By: Hilary Hart (Hilary)
2012-09-30 15:31:09 PDT (-0700)

I am quite curious to know whether or not the two are actually one species or two. I hope time will tell soon!

As to the color, I have had much difficulty in the past getting pale colors to show up on photographs. That is why I selected var. citrina, for I just assume the color is a bit more apparent when seen in person. Certainly is very light though.

Thanks again for all the information!

Hello, Hilary.
By: R. E. Tulloss (ret)
2012-09-30 14:46:11 PDT (-0700)

There are some European authors who maintain that color is the only difference and that the two taxa should not be segregated at the level of variety or any other level. My personal experience with the species in the fresh state is limited to one series of days collecting in Scotland and England. That’s not a lot of experience. I also have dried material (often with photographs) from other European locations. I have never seen an intermediate form (but this does not confirm or deny the idea that the two entities are color variants of a single species).

At present I have arranged for samples of the two possibly distinct taxa from my herbarium to have the so-called “barcode” gene sequenced for multiple collections with the yellow cap and multiple collections with a white cap. If the genes indicate that the two cap colors are genetically grouped by color, this would offer support for segregating the two varieties. If the two cap colors are not segregated genetically, then we have some support for the idea that there is only one taxon present.

A species is a hypothesis for which there is evidence pro (we hope) and (sometimes) con. We have to interpret the evidence that exists at a given time and decide whether to support or reject the hypothesis or take no action at all.

There is no absolute certainty…ever.

One thing about bulbosa var. citrina is that the literature emphasizes (via illustrations especially) the intensity of the yellow coloration of the cap. One of the reasons that Coker gave for segregating what we now call citrina f. lavendula is that the cap was paler than in the color illustrations of “citrina” that existed in his European references (early 20th Cent. and mid to late 19th Cent.).

The caps in the photographs of seadragon seem very white to me and certainly not an intense yellow; so I’m still inclined to choose the type variety of A. bulbosa as a more likely determination.

I hope this helps, Hilary.

Very best,

R

Ret, if you happen to read this,
By: Hilary Hart (Hilary)
2012-09-30 10:18:49 PDT (-0700)

..could you tell me if there is any difference between Amanita bulbosa and Amanita bulbosa var. citrina besides the presence of yellow coloration?

Thank you,

Hilary

Created: 2012-09-29 23:01:11 PDT (-0700)
Last modified: 2012-09-30 14:49:06 PDT (-0700)
Viewed: 113 times, last viewed: 2016-11-11 21:40:40 PST (-0800)
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