Observation 82776: Mycena aetites (Fr.) Quel.

When: 2011-11-18

Collection location: Hillsboro, Washington Co., Oregon, USA [Click for map]

Who: Sava Krstic (sava)

Specimen available

Growing among grass, in a lawn. Two groups observed, each about 20 mushrooms.
In situ photos taken on November 21 at exactly the same location.

Cap surface (grey-)brown, gills greyish too. Stem color similar, lighter on top. Stem fragile, white fibrils at the base.

No significant odor.

Basidia 4-spored. Spores 7-8 × 4-4.5 microns, amyloid.

Used Robich’s comprehensive key to Fragilipedes species (), but there was no match.

Species Lists


Hyphae from the cortical layer of the stipe.
Hyphae from the cortical layer of the stipe.
Hyphae of the pileipellis.
Hyphae of the pileipellis.

Proposed Names

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Add Comment
Aronsen’s site and M. aronsenii
By: Sava Krstic (sava)
2011-11-19 11:57:24 CST (-0500)


Thanks for your comments. Yes, I looked at Aronsen’s wonderful site on Norwegian Mycenas and, in fact, for every Mycena I look at, I check this site too. I love his photos and presentations and am happy I can use them.

As for this particular mushroom collection, I agree that it’s in the vicinity of M. aronsenii and I tried to match it with all existing descriptions of related mushrooms, but so far haven’t found a good fit.

I suppose
By: Irene Andersson (irenea)
2011-11-19 05:26:02 CST (-0500)
Probably not aronsenii
By: Irene Andersson (irenea)
2011-11-19 05:22:44 CST (-0500)

but something in the vicinity? The description of aronsenii is based on very little material, just one collection from Norway, so maybe the whole diversity of the species isn’t known yet. The leptocephala group is usually described in a very wide sense – said to be in great need of more investigation and revision.

By: Sava Krstic (sava)
2011-11-19 04:56:25 CST (-0500)


M. aronsenii was the closest match I could come up with too, but

- spores in aronsenii are at least 5 microns wide, while what I measured was 4.5 at most; - the number of gills reaching stem is said to be 16-18 in aronsenii, and I counted 26; - the cap of aronsenii is up to 8 mm (dried), and some of mine are over 20 mm; - the terminal cell of the hyphae in stipetipellis look much wilder then what I was able to see.

The only photo of aronsenii I could find is in Robich’s book. There is nothing grey in it, even if gills are said to be grey.

Can we eliminate M. aronsenii based on the above? I did, but don’t really know.

I don’t know mycenas well
By: Irene Andersson (irenea)
2011-11-19 04:31:06 CST (-0500)

but Mycena aronsenii looks like a possibility – or something very close.

It’s in the leptocephala group – separated from the rest by diverticulate caulocystidia and smaller spores. But yours are even smaller…

Created: 2011-11-19 02:15:43 CST (-0500)
Last modified: 2017-09-22 01:01:05 CDT (-0400)
Viewed: 189 times, last viewed: 2018-07-16 14:22:52 CDT (-0400)
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