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About: Armillaria mellea (Vahl) P. Kumm.
Rank: Species
Status: Valid
Name: Armillaria mellea
Author: (Vahl) P. Kumm.
Citation:
Version: 5
Previous Version: 4
Notes and Comments:
Copied from Darvin’s comment on Observation 4530:
“In California, both Armillaria mellea and A. ostoyae have a thick, felty annulus and they are the only Armillaria species here to have that character. They differ by the color of both the cap and the annulus. A. mellea has a white to yellow edge on the annulus, the cap is honey yellow and the disc is darker than the margin giving it a two-tone appearance. The cap is smooth and the hairs are indistinct. A. ostoyae has a brown edge on the annulus, the cap is brown with dark hairs.”
Another quick rule is that A. mellea tends to grow on hardwoods and A. ostoyae on conifers. Tom Volk definitely id’ed a collection from southern California growing on hardwood as a slightly unusual form of A. mellea. I also sent him a sample from Santa Cruz that came out as A. mellea. Apparently the California material mated with the true A. mellea, but it was not a typical mating. Macroscopically I remember Tom noting that the California material has a scalier cap than classic A. mellea (which is smooth). Based on his key it looks like microscopy and and in particular looking for clamps at the base of the basidia is the only way to be sure. Personally I have a hard enough time find a good basidia, much less figuring out whether there’s a clamp at the base.
Observations:

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Armillaria mellea (Vahl) P. Kumm. (5120)
Golden Gate Park, San Francisco, California, USA:
(Alan Rockefeller)
Observation made: 2007-11-22
Community confidence:
93%
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Armillaria mellea (Vahl) P. Kumm. (8610)
Highlands, North Carolina, USA:
debbie viess (amanitarita)
Observation made: 2008-07-21
Community confidence:
82%
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Armillaria mellea (Vahl) P. Kumm. (7098)
Lipik, Croatia:
vesna maric (kalipso)
Observation made: 2005-10-22
Community confidence:
80%
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Armillaria mellea (Vahl) P. Kumm. (5364)
Ottumwa, IA Wapello Co:
Michael (dugie)
Observation made: 2007-12-09
Community confidence:
68%
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Armillaria mellea (Vahl) P. Kumm. (6159)
West Los Angeles:
taylor (taylorist)
Observation made: 2008-01-20
Community confidence:
55%
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Armillaria mellea (Vahl) P. Kumm. (8649)
Burlington County, NJ, USA:
Scott Stafford (ses4j)
Observation made: 2003-09-29
Community confidence:
50%
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Armillaria mellea (Vahl) P. Kumm. (6081)
Petaluma, Sonoma Co., California, USA:
Darvin DeShazer (darv)
Observation made: 2008-01-16
Community confidence:
no votes
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Armillaria mellea (Vahl) P. Kumm. (5271)
Santa Rosa, Sonoma Co.,California, USA:
Debbie Drechsler (debdrex)
Observation made: 2007-11-29
Community confidence:
no votes
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Armillaria mellea (Vahl) P. Kumm. (5052)
Novato, Marin Co., California, USA:
John Kirkpatrick (natashadak)
Observation made: 2007-11-19
Community confidence:
no votes
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Armillaria mellea (Vahl) P. Kumm. (4976)
Howarth Park, Santa Rosa, Sonoma Co., California, USA:
Debbie Drechsler (debdrex)
Observation made: 2007-11-17
Community confidence:
no votes
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Armillaria mellea (Vahl) P. Kumm. (4896)
Los Trancos Preserve, Palo Alto, Santa Clara Co., California, USA:
Douglas Smith (douglas)
Observation made: 2007-11-12
Community confidence:
no votes
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Armillaria mellea (Vahl) P. Kumm. (4881)
Howarth Park, Santa Rosa, Sonoma Co., California, USA:
Debbie Drechsler (debdrex)
Observation made: 2007-11-12
Community confidence:
no votes
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Similar Observations: (Someone proposed Armillaria mellea (Vahl) P. Kumm. for these observations, but consensus hasn't accepted it. Confidence value is for this name, not the consensus name.)
Name Created: Tue Jan 09 21:03:58 -0800 2007
Last Modified: Sun Oct 28 20:31:18 -0700 2007 by Nathan Wilson (nathan)
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