Observation 212657: Amanita sect. Phalloideae (Fr.) Singer

When: 2015-08-09

Collection location: Mogollon Rim, Coconino Co., Arizona, USA [Click for map]

34.334° -110.7611° 2300m

Who: Chris May (ccmaymd)

Specimen available

Under Pinus ponderosa and Quercus gambelii.

No bruising, no distinctive scent; not tasted.

Spore description: 9.9 [9.9; 11.2] 11.5 × 5.5 [5.7; 6.7] 6.7 µm; Q = 1.54 [1.58; 1.89] 1.93; N = 30; C = 95%; Me = 10.5 × 6.2 µm; Qe = 1.69

4-spored basidia.

Specimen still in my possession. Have air-dried fruiting body and a fragment preserved in 95% ethanol. Will probably be sending it to Tulloss.


Copyright © 2015 Sergei Klokov
Copyright © 2015 Sergei Klokov
Copyright © 2015 Sergei Klokov
Copyright © 2015 Sergei Klokov
Showing the contrast between members of the sections Phalloideae and Caesareae.

Proposed Names

81% (1)
Eye3 Eyes3
Recognized by sight
Used references: Confirmed by Debbie Viess and Dr. Rod Tulloss
Based on chemical features: Meixner test weakly positive. No staining with 20% KOH.

Please login to propose your own names and vote on existing names.

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
I plotted a sporograph from your data and overlaid sporographs…
By: R. E. Tulloss (ret)
2015-08-13 04:57:14 EDT (-0400)

of common eastern and western U.S. Phalloideae. You material is distinct in the form of its sporograph. The spore shape is outside of the spore shapes in the group of taxa responding positively to KOH in North America so far as I know. I think you may have something that is new to science. I would very much like to look at your dried material, Dr. May.

I’ll email you the sporograph. If you’d like other species added, I can do that. Or you can do it on this page:


on the WAO website.

Very best,

Rod Tulloss

Created: 2015-08-13 04:32:13 EDT (-0400)
Last modified: 2015-08-13 04:43:32 EDT (-0400)
Viewed: 37 times, last viewed: 2017-06-20 14:13:30 EDT (-0400)
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