Observation 110657: Armillaria (Fr.) Staude

When: 2012-09-18

Collection location: Blacksburg, Virginia, USA [Click for map]

Who: Mark Prosser (mark prosser)

No specimen available

Found at the base of a well decayed stump, likely conifer. Photographed just after a heavy rain giving the caps a hygrophorus appearance. As seen in photos, dark brown initially, then fading to lighter shades as they mature. Unsure that any hygrophorus can grow in this way. Any help appreciated.

Proposed Names

-78% (5)
Recognized by sight
-48% (5)
Recognized by sight: Looks like Oudemansiella mucida, usually growing on beech
-37% (5)
Recognized by sight: viscid caps, viscid stem, viscid partial veil, many fruit bodies, near wood
-10% (5)
Recognized by sight: updated photo reveals A. mellea features
37% (4)
Used references: Used Tom Volk’s provisional key at http://botit.botany.wisc.edu/toms_fungi/armkey.html

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

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
By: Richard Kneal (bloodworm)
2012-09-29 03:20:50 CEST (+0200)

forgive me if i am incorrect…
but, isn’t Armillaria solidipes a PNW fruiter??

Not Armillaria mellea
By: Nathan Wilson (nathan)
2012-09-29 03:15:27 CEST (+0200)

I agree with Richard. The color is wrong for true A. mellea. Should be more yellow and even have some yellow on the veil. Also it doesn’t look quite clustered enough. See http://botit.botany.wisc.edu/toms_fungi/armkey.html for a key to Armillaria. Based on that key, Armillaria solidipes seems likely.

No spore print available.
By: Mark Prosser (mark prosser)
2012-09-23 18:19:21 CEST (+0200)

Richard, Since you’re clear that it’s not A. mellea, what are your thoughts, given no spore print is available. It helps me to hear why you rule something out with clarity for my learning process, as well as a hunch on alternative identification. Maybe, it will just have to stay Armillaria sp., but hearing specifics helps for learning, and likely will benefit others. Also, to Eric, I see the color similarity of the caps, but none of the caps had any of the tiny fibrils, even those that were protected from the rain, found underneath some deatached bark. Thanks, Mark

those are not A. mellea…
By: Richard Kneal (bloodworm)
2012-09-23 04:41:41 CEST (+0200)

Armillaria, probably.
but certainly not A. mellea.
i’d like to see a spore print.

Updated photo reveals Armillaria mellea, I think !
By: Mark Prosser (mark prosser)
2012-09-23 04:36:54 CEST (+0200)

I returned to photograph this grouping three days after the initial shots were taken, revealing Armillaria mellea. I was confused by the effect of the heavy rain on the young caps, so went back to discover what these looked like at a more mature state. Thanks for everyone’s thoughts and input. Mark

I agree
By: Irene Andersson (irenea)
2012-09-22 22:12:45 CEST (+0200)

It looks similar to obs 110735, Armillaria solidipes.
Would have been nice if it was Oudemansiella, though :-)

The caps on these
By: Eric Smith (esmith)
2012-09-22 18:57:34 CEST (+0200)

look quite similar to this observation:
which are definitely Armillaria. I can attest that the caps become quite viscid when wet because I took this collection home and washed them. I was unable to completely remove the slime. The scales may have been destroyed by the rain. Growing from the base of a conifer stump sound about right…

By: Dave W (Dave W)
2012-09-22 16:40:24 CEST (+0200)

Simon and Schuster report that O. mucida is not found in North America. None of my other mushroom books (North American based) mention either it or A. mucida, except for McIlvaine. Even Arora makes no mention of either species name in “Mushrooms Demystified.” Here on MO all of the NA Oudemansiella observations come from southern locations like Florida or Texas.

And Dave..
By: Irene Andersson (irenea)
2012-09-21 21:08:08 CEST (+0200)

Phillips isn’t well informed then! Already Charles McIlvaine, back in the 19:th century, noted that the american distribution of Oudemansiella mucida extended to North Carolina, Pennsylvania and West Virginia. But at that time it went by the name Armillaria mucida :-)
Being a saprobe(or parasite), it can be expected wherever there’s occurence of old beech trees.

By: Irene Andersson (irenea)
2012-09-21 19:23:36 CEST (+0200)

Can you manage to find these again in a week or so, and take new photos?
That might solve the mystery :-)

Irene, the links…
By: Dave W (Dave W)
2012-09-21 17:23:10 CEST (+0200)

each show European material. Phillips lists O. mucida as a European species.

Note that the collection was made just after a heavy rainfall.

Created: 2012-09-21 03:03:57 CEST (+0200)
Last modified: 2014-04-23 21:16:58 CEST (+0200)
Viewed: 294 times, last viewed: 2017-06-14 09:58:26 CEST (+0200)
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