Observation 108030: Amanita spreta (Peck) Sacc.
When: 2012-09-01
Herbarium specimen reported

Notes: Stem stains blackish when handled.

Cap – 8cm
Stem – Just over 10cm

Spore Data:

[25, 1, 1] (8.0) 8.1 – 9.2 (9.3) x (5.6) 5.7 – 6.3
Q = 1.35 – 1.51
L’ = 8.6
W’ = 6.0
Q’ = 1.43

Proposed Names

28% (1)
Eye3
Recognized by sight
ret
54% (1)
Eyes3
Recognized by sight

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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Thank you, Steve.
By: R. E. Tulloss (ret)
2013-06-03 13:42:10 PDT (-0700)

I’ve accessioned this for the moment under the name Amanita spreta. It is scheduled for sampling.

Very best,

Rod

Spores.
By: R. E. Tulloss (ret)
2012-09-02 10:25:17 PDT (-0700)

When Jenkins examined the (old!) type collection of A. spreta he reported the spores were 10.2 – 13.3 × 5.5 – 7.0 μm, (Q = 1.62 – 2.11; bold Q’ = 1.86). So my measurements are close to the measurement from the type. I think that the spores of the type may have shrunken a bit…I have never see an average Q as high as 1.86; but I did see one close to that (1.81). I don’t know how many spores Jenkins measured; he didn’t report on that. I have measured 214 spores from ten different specimens—each from a separate collection.

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

Very best,

Rod

I was wondering the same thing….
By: Stephen Russell (Mycota)
2012-09-02 08:53:51 PDT (-0700)

I am getting a more accurate calibration slide from the univeristy on Monday to rule out any error. Although Kuo, on his A. spreta page suggests the spores are:

“Spores 10-13.5 × 5.5-7 µ (8.5-10 × 6-7 µ in my collections)”

http://www.mushroomexpert.com/amanita_spreta.html

Except for the spore measurements,…
By: R. E. Tulloss (ret)
2012-09-02 06:53:10 PDT (-0700)

I’d say this was Amanita spreta.

R

Created: 2012-09-01 20:55:04 PDT (-0700)
Last modified: 2013-06-03 13:42:56 PDT (-0700)
Viewed: 63 times, last viewed: 2017-01-08 05:56:18 PST (-0800)
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