Observation 60135: Amanita cokeri (E.-J. Gilbert & Kühner) E.-J. Gilbert
When: 2010-08-07
No herbarium specimen

Notes: 8 days in the life of Amanita cokeri

Images

192091
August 7, 2010
124468
Amanita cokeri August 12, 2010
124469
Amanita cokeri August 12, 2010
124470
Amanita cokeri August 12, 2010
124471
Quickly fading by August 15, 2010
124484
Gray warts?
124485
Tan warts?
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Pale tan on cap?
124487
Quickly fading by August 15, 2010
192092
August 9, 2010

Proposed Names

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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Thanks Rod
By: Martin Livezey (MLivezey)
2010-12-03 10:30:30 GAMT (-0900)

The only change I made to this Ob (my first on MO) was to trim two of the photos. I seem to be getting pickier – cropping closer and adjusting contrast.

handkerchief —editted
By: R. E. Tulloss (ret)
2010-12-03 10:10:03 GAMT (-0900)

Using a white handkerchief over the flash permits you to experiment with how many layers of the handkerchief you utilize…it’s sort of like bracketing your exposure.

I try not to use flash. I “surround” my target with reflectors made of shirt cardboards or backs of pads of lined paper wrapped [<-previous word was incorrectly written “warped”] in not very smooth aluminum foil and then hinged in pairs to make “book-like” objects. The positioning of the reflectors is (of course) dependent on the position of the sun or other light source (best to be in shade under open sky to avoid highlights). I set up a tripod, shut the lens down as much as possible (to get maximum depth of field), and let the camera decide on a time exposure.

R.

Thanks again for your comments!
By: Martin Livezey (MLivezey)
2010-12-03 08:07:26 GAMT (-0900)

The photos I can add are poor – I was just learning to use the settings for low light on a white mushroom with our point-and-shoot camera. I now use the auto adjust setting w/o a flash and program mode with iso set as low as possible (100) with flash. I have also experimented with holding a few layers of wax paper over the flash. Sometimes this helps. The photos show a very pale tan on the cap and some color between gray and brown on the warts. The last couple of photos show drumsticks with distinctly brown warts – I thought these were probably also cokeri. I was still at the ‘look but don’t touch’ stage. I did not cut, dig up, or sniff any of these. – next year!

Very nice documentation
By: R. E. Tulloss (ret)
2010-12-03 07:48:22 GAMT (-0900)

I think your ID is probably correct. The parts of the partial veil and the formerly attached volva on the stem, the typical cap warts and the recurved scales on the bulb, the COMPLETE LACK of pinkish staining, the detachment of the old warts shown in the last picture…all these things are very distinctive. When the mushroom was just fully expanded (about the third picture) was there any odor at all?

I think it is fair play to lighten the dark pictures (by auto contrast correction) in Photoshop. They would be easier to analyze if they were closer to the “natural color” of the mushroom.

I think you did a good job, and I don’t think that I’ve seen a series like this (for A. cokeri) before.

Interesting.

R.

Created: 2010-12-03 07:01:15 GAMT (-0900)
Last modified: 2011-12-29 16:52:58 GAMT (-0900)
Viewed: 253 times, last viewed: 2016-10-22 19:37:00 GAMT (-0900)
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