Observation 132909: Coprinus asterophoroides

When: 2013-05-03

Collection location: Rooster Rock State Park, Multnomah Co., Oregon, USA [Click for map]

Who: Daniel B. Wheeler (Tuberale)

No specimen available

On downed cottonwood log, in massive clusters.


To 4 inches tall (10 cm).
Blackish gills, conical, on downed black cottonwood.
Cap flesh creamy, becoming black. Gills crowded. Spores black.
Volval patches on cap: whitish to light brown.
Volval patches on cap.

Proposed Names

29% (1)
Eye3 Eyes3
Used references: Arora, Mushrooms Demystified. Lacks volva at base of stipe. Plentiful cap patches. Mushroom growing in large clusters, with volval patches on caps.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Woke up this morning and checked on fungi.
By: Daniel B. Wheeler (Tuberale)
2013-05-04 17:10:57 CDT (-0500)

Sporocarp completely deliquenced into black goo. 30mph warm wind not conducive to holding Coprinus.

By: Daniel B. Wheeler (Tuberale)
2013-05-03 23:26:20 CDT (-0500)

I had not heard of C. asterophoroides before searching for this species.

Found in a large clump of perhaps 200-300 specimens, growing on a downed but off-the-ground log. The primary striking feature for me was the volval patches on the cap. Almost all mature fungi had this feature. Less mature or specimens underneath the larger specimens did not have volval patches readily visible.

Thanks for the mention of the svims.ca council and their key. This does not seem to match any of the species mentioned, but I admit I found the volval patches poorly identified in the key.

I remember the log as being about a foot in diameter. The mushrooms were growing on silty soil deposited on top of the log, along with some grasses obscurring some specimens.

I did not take a photo of the clump as I did not have my camera with me at the time. This obs. seems noteworthy enough to demand a return tomorrow with camera in hand. Volval patches remind of Amanita. No volva at base of stipe, and I know of no Amanita species growing from wood anyway. I don’t think anything was over 5 inches tall in the clump. Today was nearly 80 degrees in the gorge. Tomorrow they may well be gone.

I don’t know about Coprinus asterophoroides
By: Alan Rockefeller (Alan Rockefeller)
2013-05-03 17:30:20 CDT (-0500)

It doesn’t match all that well with the description in http://www.svims.ca/council/Coprin.htm

While it looks close to Coprinopsis atramentaria, the universal veil remnants are interesting.

According to http://mushroomobserver.org/name/show_name/1823 and http://www.mykoweb.com/CAF/species/Coprinus_calyptratus.html, the most current name for that taxon is Coprinus calyptratus.

Created: 2013-05-03 17:13:30 CDT (-0500)
Last modified: 2013-05-03 17:13:32 CDT (-0500)
Viewed: 112 times, last viewed: 2018-04-20 13:47:21 CDT (-0500)
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