Aborted Entoloma

(Entoloma abortivum)

               
Conservation Status

IUCN Red List

not yet assessed

Aborted Entoloma

NatureServe

not listed

Minnesota

not listed

Occurrence

Common and widespread in eastern North America

Season

Mid-September through October

Habitat/Hosts

Hardwood forests

 

 

 

 

    Photo by Kirk Nelson

Identification

Aborted Entoloma is both a typical mushroom and an infection of other mushrooms. As a typical mushroom, it obtains nutrients from non-living organic matter (saprobic), specifically woody debris and leaf litter. As an infection, it grows with and obtains nutrients from (parasitizes) Honey Mushroom (Armillaria mellea group). When a Honey Mushroom is infected, it forms a lumpy mass called a carpophoroid.

Aborted Entoloma is common and widespread in eastern North America in hardwood forests. It is found from mid-September through October on the ground, scattered or in groups, near decaying wood or in leaf litter. It is most often found with or near Honey Mushrooms. It is easily identified in its aborted (carpophoroid) form, and nearly impossible to identify in its mushroom form.

Mushroom
The cap is ¾ to 3 in diameter and convex at first. It is gray to grayish-brown, hairless, and dry. The margins are rolled under. As it ages it becomes broadly convex or flat, with or without a raised bump in the center.

The stalk is ¾ to 3 long and 3 16to thick. It is solid, hairless or finely hairy, and sometimes somewhat enlarged at the base. The base of the stem is covered with a white fuzz that is part of the underground, vegetative component (mycelium).

The flesh is white and dense. It is edible but difficult to distinguish from other poisonous Entolomas. For this reason, only the aborted carpophoroid version should be eaten.

The gills are pale gray at first, becoming pink due to a covering of spores. They are close and slightly run down the stalk.

The spore print is pink.

Carpophoroid
The aborted form is an irregular, often lumpy mass. It is ¾ to 3 high and often depressed in the middle. It is white at first, becoming brownish with age. The flesh is marbled white and pinkish. The stalk, if present, is short. There are no gills.

 
Similar
Species

 


Distribution Distribution Map  

Sources: 4, 7, 24, 26, 29, 30, 77.


Comments

Carpophoroid
A carpophoroid is the above-ground structure of a fungus whose development suggests a fruiting body but stops before developing a normal mushroom shape and does not become reproductive. When this fungus was first described, it was thought that the lumpy mass was a Entoloma abortivum (then called Clitopilus abortivus) mushroom that never developed properly. Studies by Roy Walting in 1974 showed it to be a fungus parasitized by another fungus. He concluded that the aborted fruiting body was an E. abortivum mushroom parasitized by a Honey Mushroom (Armillaria mellea group). In 2001, research published in Mycologia (Czederpiltz, Daniel Linder, Thomas J. Volk, and Harold H. Burdsall, Jr. 2001) suggested that the carpophoroid is in reality a Honey Mushroom parasitized by the E. abortivum fungus. This conclusion remains controversial because Honey Mushroom is only found growing on wood and Aborted Entoloma is only found growing on the ground. If true, Volk suggests that the common name is incorrect and should be changed to Aborted Armillaria.


Taxonomy

Division:

Basidiomycota (club fungi)

 

Subdivision:

Agaricomycotina (jelly fungi, yeasts, and mushrooms)

 

Class:

Agaricomycetes (mushroom-forming fungi)

 

Subclass:

Agaricomycetidae

 

Order:

Agaricales (gill mushrooms)

 

Family:

Entolomataceae

 
Synonyms

Agaricus abortivus

Clitopilus abortivus

Pleuropus abortivus

Rhodophyllus abortivus

 
Common
Names

Aborted Entoloma

shrimp of the woods


 

 

 

 

 

 

 

Glossary

carpophoroid

The above-ground structure of a fungus whose development suggests a fruiting body but stops before developing a normal mushroom shape and does not become reproductive.

 

parasitic

Obtaining nutrients from another living organism.

 

saprobic

Obtaining nutrients from non-living organic matter, such as decaying plant or animal matter.

       

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Kirk Nelson


  Aborted Entoloma   Aborted Entoloma

       
       
       

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Other Videos

 
  Aborted Entoloma Mushroom
MiWilderness
 
   
 
About

Published on Sep 27, 2011

Thanks for watching MiWilderness.

 
     
  Aborted Entoloma Griseum? Midwest Wild Mushrooms
Earthwalker40
 
   
 
About

Published on Oct 20, 2013

Please comment, share, like and subscribe: https://www.youtube.com/user/Earthwalker40

These appear to be a type of Entoloma mushroom which have been parasitized by an invading mycelium(Armillaria). I could find no Armillaria mushrooms, but many entolomas. One aborted appears to be growing from the same mycelium as an Entoloma mushroom.

Aborted Entoloma Griseum? Midwest Wild Mushrooms
Wild mushroomhunting
how to find mushrooms
edible wild mushrooms
midwest wild mushrooms
ohio muwshrooms

 
     
  Aborted Entoloma
Chris Matherly
 
   
 
About

Published on Nov 16, 2007

Video of Aborted entoloma mushrooms

 
     
  Found some Abortive Entoloma, Entoloma abortivum today!
MushFarmer
 
   
 
About

Published on Oct 18, 2016

The controversy, does abortive entoloma parasite honey mushrooms (Armillaria mellea) or is it the other way around? Or something completely different.

https://www.youtube.com/redirect?redir_token=QuONatMdIp4Of9RSs-c8IFzsROp8MTUwNjUyOTExOEAxNTA2NDQyNzE4&event=video_description&q=http%3A%2F%2Fwww.mushroomexpert.com%2Fentoloma_abortivum.html

In my limited experience it seems to me that honey mushrooms would not be growing in the locations where I found these entoloma. Notice the first set around a healthy young tree. I have yet to find any honeys growing off of healthy trees, especially young. The second set growing off the dead rootball of the tree seems an unlikely location for honey mushrooms to grow either, growing from the muddy side.

I did not see any honey mushrooms in the immediate area of both groups (doesn't mean they were not there though). I do see honey's growing in small amounts all through the forest.

I did not see any entolomas around the large honey mushroom grow site of my previous video (and most of those honeys were breaking down now). I am thinking about experimenting next year and spraying entoloma liquid culture/spores in that large honey mushroom area to see if I can force the parasitification.

The Lobster mushrooms: https://www.youtube.com/redirect?redir_token=QuONatMdIp4Of9RSs-c8IFzsROp8MTUwNjUyOTExOEAxNTA2NDQyNzE4&event=video_description&q=http%3A%2F%2Fwww.mushroomexpert.com%2Fhypomyces_lactifluorum.html

 
     
  Abortive Entoloma (snow shrimp)
Mark Robie
 
   
 
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Published on Oct 7, 2013

 
     

 

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Kirk Nelson
9/10/2017

Location: Lebanon Hills Regional Park

Aborted Entoloma


     
     
 

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