Observation 140680: Hypomyces chrysospermus Tul. & C. Tul.

When: 2013-07-22

Collection location: York Co., Maine, USA [Click for map]

Who: Erlon (Herbert Baker)

Specimen available

Species Lists


Copyright © 2013 Erlon Bailey
Copyright © 2013 Erlon Bailey
Copyright © 2013 Erlon Bailey
Copyright © 2013 Erlon Bailey
Copyright © 2013 Erlon Bailey
Copyright © 2013 Erlon Bailey
Copyright © 2013 Erlon Bailey
Copyright © 2013 Erlon Bailey
Copyright © 2013 Erlon Bailey

Proposed Names

5% (3)
Recognized by sight
-40% (4)
Used references: Arora, Mushrooms Demystified. I’ll admit this obs. has my curiosity up. The only fungus with that color exudate (dark red droplets) is Hydnellum peckii.
1% (4)
Recognized by sight: Maybe the droplets came from elsewhere.
70% (3)
Recognized by sight

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

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
By: Erlon (Herbert Baker)
2017-10-11 09:40:01 CDT (-0400)

Yes. Mycoparasites, in general, are not well studied, there are probably many undescribed species also. Thanks.

Is Hypomyces microspermus also a possibility here?
By: Guy (Some Guy)
2017-10-10 15:16:03 CDT (-0400)

Agree that this looks like a parasatized Strobilomyces. But, how do you differentiate between Hypomyces microspermus and Hypomyces chrysospermus?

By: Erlon (Herbert Baker)
2014-09-06 23:13:28 CDT (-0400)

.. to new observation showing the same characteristics. http://mushroomobserver.org/177181

By: Erlon (Herbert Baker)
2014-08-25 17:27:21 CDT (-0400)

here is another photo of Strobilomyces that has been attacked by Hypomyces, causing the exudation of dark amber droplets.


By: Erlon (Herbert Baker)
2014-08-25 17:20:20 CDT (-0400)

I think it is a defensive response to specific pathogen and/or breakdown of host causing the exudation.
Not sure why the link doesn’t work. If you type in “strobilomyces mycoparasite” the image is in the forth row down. (look for the dark amber droplets)
Thanks for your help.

The photo you provided
By: Daniel B. Wheeler (Tuberale)
2014-08-25 17:03:02 CDT (-0400)


is recognizeable as Strobilomyces parasitized by the white form Hypomyces chrysosperum. Hypomyces chrysospermum does not have red exudate droplets.

The google image was not available.

By: Erlon (Herbert Baker)
2014-08-25 16:41:24 CDT (-0400)

Here are a couple images of Strobilomyces being parasitized. The second photo shows dark amber droplets being exuded.



If nothing of the obs.
By: Daniel B. Wheeler (Tuberale)
2013-07-24 13:11:12 CDT (-0400)

was recognizable as Strobilomyces, clearly it isn’t Strobilomyces.

Having grown mushrooms (shiitake, Hericium, et al) for 25 years, I can definitively state some mushroom growers do not see this from time to time.

When I have seen it, the metabolites are clear or slightly yellowish for white wood-rotting fungi.

Mutated. See above.

Bacterial. See above.

By: Erlon (Herbert Baker)
2013-07-24 01:00:43 CDT (-0400)

Metabolites? Yes, defensive metabolites. Most mushroom growers see this from time to time.

Clearly mutated? Yes, I do not believe this mushroom is in its typical form.

Bacterial? On second thought, due to the none dirty sock smell, probably a mycopathogen of some sort.

By: Daniel B. Wheeler (Tuberale)
2013-07-24 00:49:47 CDT (-0400)


Clearly mutated?


By: Erlon (Herbert Baker)
2013-07-24 00:36:35 CDT (-0400)

Clearly mutated. The inside of the cap was a dark gooey mess, with neither teeth, gills, pores or spines, to speak of. Mushrooms are known to exude liquid metabolites when they have certain bacteria infections. Although, it had a nice rich mushroomy smell. Where you see the larger amber droplets, that is a split in the stipe of the mushroom.

Obs. without tubes.
By: Daniel B. Wheeler (Tuberale)
2013-07-23 19:33:05 CDT (-0400)

Compare to MO obs: 140516, 140403, 140326, 139872, 139558, 133933.

Cannot be Strobilomyces without.

By: Erlon (Herbert Baker)
2013-07-23 15:08:05 CDT (-0400)

If this is indeed a mycoparasite attacking it, the morphology can be quite different; this mushroom seems to have a small regular mushroom shaped cap unlike H. peckii.
You can see the pileus clearly in the second photo, on the left; the mushroom has been laid down on its side.

By: Daniel B. Wheeler (Tuberale)
2013-07-23 14:11:32 CDT (-0400)

should have more erect spines on the cap (pileus) which normally are black or blackish. It does indeed looks kind of like Strobilomyces, but even if parasitized by, say, Hypomyces for instance, would not have amber to dark red exudate. The only species that comes readily to mind is Hydnellum peckii, which can lose the droplets quickly.

By: Erlon (Herbert Baker)
2013-07-23 08:18:24 CDT (-0400)

I’m not sure. I thought it was an infected Strobilomyces sp.

By: Daniel B. Wheeler (Tuberale)
2013-07-23 02:37:07 CDT (-0400)

with amber to dark reddish exudate? Are you certain this is not a Hypomyces-infected Lactarius instead?

Created: 2013-07-23 00:46:28 CDT (-0400)
Last modified: 2017-10-10 15:12:48 CDT (-0400)
Viewed: 270 times, last viewed: 2018-01-22 22:43:33 CST (-0500)
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