Observation 183925: Entoloma abortivum (Berk. and M.A. Curtis) Donk
When: 2014-10-18
No herbarium specimen

Notes: Unaborted fruit bodies growing on ground and on the wood of a dead standing oak. Aborted fruit bodies at base of unaborted fruit bodies. Armillaria mellea fruit bodies growing at base of same tree.


pinkish spore deposit
subdecurrent gills and white mycelium
E. abortivum—unaborted above, aborted below
A. mellea
E. abortivum on right, A. mellea on left

Proposed Names

85% (1)
Eye3 Eyes3
Recognized by sight: gray brown cap, subdecurrent pinkish gray gills, whitish stem with swollen base and white mycelium, pink spore deposit

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Eye3 = Observer’s choice
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Or should both names be applied?
By: Dave W (Dave W)
2014-10-19 23:29:09 CDT (-0400)

The aborted FB presumably contains materials genetically identified as either species. But the standard seems to be that the parasite gets the nod. For instance, we do not call Hypomyces lactifluorum “Lactarius”, even though that’s what is often underneath the parasitized surface of the lobster mushroom.

So perhaps my earlier claim that the name “Entololma abortivum” is incorrectly applied to the aborted FB needs to be revised. The Armillaria FB which has been parasitized is representative of the organism Entoloma abortivum in the same way that the parasitized Lactarius mushroom is representative of Hypomyces lactifluorum.

However, as you point out, the aborted Armillaria FB contains neither the reproductive mechanisms of Armillaria nor Entoloma.

Yes, Michael Kuo discusses the question of who is parasitzing whom on his website,
By: Terri Clements/Donna Fulton (pinonbistro)
2014-10-19 22:15:53 CDT (-0400)

but I was wondering why the aborted form would take the name of either E. abortivum or A. mellea, for example, when it is neither—no gills, no spore print, no cap, no stem etc.

I believe this same name…
By: Dave W (Dave W)
2014-10-19 01:22:11 CDT (-0400)

for the E. abotivum mushrooms and the aborted forms goes back to an hypothesis that is not part of our current understanding of this fungus. That is, it was once believed that the aborted forms were abnormally developed FBs of the Entoloma fungus that had been parasitized by Armillaria. Last I checked, the current understanding was that the aborted forms are abnormally formed FBs of an Armillaria fungus that has been parasitized by the Entoloma. So the name, as applied to the aborted forms, is incorrect.

Any one have any ideas
By: Terri Clements/Donna Fulton (pinonbistro)
2014-10-18 21:50:10 CDT (-0400)

as to why E. abortivum is called by the same name in its aborted and unaborted state?

Created: 2014-10-18 21:37:34 CDT (-0400)
Last modified: 2014-10-18 21:44:13 CDT (-0400)
Viewed: 36 times, last viewed: 2016-10-24 20:35:07 CDT (-0400)
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