Observation 138453: Marasmius Fr.

When: 2013-07-02

Collection location: Beck Lake, Glenview, Illinois, USA [Click for map]

Who: Rocky Houghtby

Specimen available

White near distant lamellae, not marginate. Lamellae and stipe exude red latex when crushed.

Proposed Names

-84% (1)
Recognized by sight
3% (2)
Used references: Arora, Mushrooms Demystified.
44% (2)
Recognized by sight
28% (1)
Recognized by sight

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
The pileus margin
By: Rocky Houghtby
2013-07-04 19:49:26 CEST (+0200)

Was not appendiculate or scalloped, as far as I could tell. The mycelium in this observation is rhizomorphic and binding tree litter, soil and some vegetation, the primary component seeming to be rotting leaves.

The only other species with red- purple latex that I am aware of, so far, are M. crocata and M. Anamola, one of which enjoys a coniferous habitat and neither seeming any closer to this observation than M. haematopus.

I linked the literature that I am using in my previous comment. Of all of the described species in section lactipedes, M. haematopus seems closest. Perhaps microscopic examination will confirm the proposed name.

Only 3 with blood red exudate, usually from the base of the stipe.
By: Daniel B. Wheeler (Tuberale)
2013-07-04 19:22:51 CEST (+0200)

M. haematopus, usually on wood (and in this case, perhaps on old Black walnut shell, which would provide less food than wood); M. sanguinolenta (in Arora, Terrestrial Bleeding Mycena, on ground); and M. subsanguiolenta (underconifers in northern California).

M. haematopus is the only species arrising from (usually) hardwood logs and stumps. In addition, the rim may have a band of sterile tissue, similar to a veil, which may “form a scalloped rim around the cap.”

Others with exudate in Mycena have white, orange, or browns.

Do you know of other Mycenas with exudate? You may have better sources than I.

By: Rocky Houghtby
2013-07-04 16:59:26 CEST (+0200)

There are twelve species in section lactipedes that exude latex. Additionally, Smith mentions several species in other sections that exude copious amounts of colored fluid that can appear latex-like. The thing that’s hanging me up on haematopus is the absence of orange, brown or gray coloration in the pileus. Also, this was minutely striatulate- haematopus should be somewhat grooved. In my experience the striations are pronounced throughout maturity. Also, in regards to the length of the stipe, I have only observed M. haematopus become eccentrically stipitate when arising from beneath bark or an obstruction. This collection was arising directly from the substrate as pictured.

To answer your question, yes it is likely that part of the litter being bound by the mycelium was shell fragments.

Thanks for sharing your experience!

Section lactipedes in the smith monograph-


At the base of Black walnut?
By: Daniel B. Wheeler (Tuberale)
2013-07-04 09:02:31 CEST (+0200)

Could it have been growing on a walnut shell?

I was thinking M. haematopus.
By: Daniel B. Wheeler (Tuberale)
2013-07-04 08:58:48 CEST (+0200)

Then thought this is a very small clustered specimen. M. haematopus can have 6-7 inch stipe.

Only Mycena with bleeding stipe I’m aware of is Mycena haematopus. I think that feature in and of itself is pretty descriptive.

M. haematopus?
By: Rocky Houghtby
2013-07-03 05:31:21 CEST (+0200)

This doesnt really look like M. haematopus. sorry for the lack of gill shots. found at the base of Juglans nigra.

Created: 2013-07-03 05:18:34 CEST (+0200)
Last modified: 2013-07-12 06:10:35 CEST (+0200)
Viewed: 244 times, last viewed: 2017-06-16 12:00:07 CEST (+0200)
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