Observation 106493: Amanita bisporigera G.F. Atk.

When: 2012-08-22

Collection location: Roberts Property, Cumberland Co., Tennessee, USA [Click for map]

Who: Steve Roberts (Mushroom World)

No specimen available

quite large specimen growing solo beside a Hemlock and not too far from a Red Oak

a bit of a disagreeable odor

overall size = 21 cm long

cap 12 cm wide

stipe 23 mm wide at widest point (near base) and 12 cm wide at narrowest point (near apex)

KOH on cap turns bright yellow

stipe lacks a ring… could this be a very large A. bisporigera and the ring has vanished?

Additional information added 8/24/12:
spores subglobose to globose; 8.5 -11 × 8.5 -10 um

Proposed Names

61% (2)
Recognized by sight: have reservations it is A. bisporigera due to exannulate stipe -also it is larger than any A. bisporigera I’ve ever seen
Based on chemical features: cap bright yellow in 5% KOH

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
I’ve seen them quite large, too,
By: Steve Roberts (Mushroom World)
2012-08-25 00:52:02 EDT (-0400)

though not quite this big. But, what’s really bugging me is the lack of a ring on the stipe. Since we haven’t had any rain lately, getting washed away isn’t an option.

I have seen them pretty large
By: Patrick Harvey (pg_harvey)
2012-08-24 13:37:13 EDT (-0400)

Created: 2012-08-22 23:24:42 EDT (-0400)
Last modified: 2012-08-24 13:34:09 EDT (-0400)
Viewed: 35 times, last viewed: 2017-06-13 22:48:04 EDT (-0400)
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