Observation 73728: Psathyrella (Fr.) Quél.

When: 2011-08-02

Collection location: Fall Creek, Lane Co., Oregon, USA [Click for map]

43.975785° -122.554357°

Who: Daniel Neall (MycelialDiaSPOREa)

No specimen available

Found near shallow bank of meandering creek. Water flow ranging from swift rapids, to deep, calm, swimming holes. Oxygenated, cold water. Roughly 1000 FT above sea level.

AVG Air Temp *F July Aug.
Avg Max Temperature 84.9 84.0
Avg Min Temperature 54.9 51.9
Avg Avg Temperature 69.9 67.9


Stipe & Cap
Underwater substrate
Amphibious mushroom habitat.
14 day water temperature graph

Proposed Names

30% (9)
Recognized by sight: Looks like P. gracilis, growing from underwater

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

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Unfortunately this one will remain a mystery.
By: Daniel Neall (MycelialDiaSPOREa)
2011-09-02 12:20:43 PDT (-0700)

The branch was quite long, anchored by many river rocks and ‘cemented’ by the fine sediment surrounding. It appears the substrate was likely underwater for a long time, possibly being deposited by increased water flow due to the previous years rain season. But this is just speculation.

The fruit was sturdy enough to grow erect despite the current, which was noteworthy considering the shallowness of the water. Evidence of the current is somewhat visible in the motion blur of passing particles, and riffle caused by the protruding stipe. The mushroom appears quite strong compared to most Psathyrellas I’ve experienced.

If indeed a terrestrial fungi which was already established, and displaced by last years rain season, it seemed surprisingly adept at growing while submerged in flowing water.

I was skeptical from the beginning that this is indeed P. aquatica, however, my research into amphibious fruiting mushrooms is not going too smoothly.

Unfortunately this one will remain a mystery.

I wanna believe…
By: Debbie Viess (amanitarita)
2011-09-02 07:49:01 PDT (-0700)

but the puzzle pieces aren’t all fitting together.

Psath aquatica occurs in FAST-flowing streams, and not at their banks but in the deepest portion of the channel. This pretty much guarantees that the fruit body will develop wholly underwater. The stipe of aquatica is fibrillose and the smooth cap has a very thin cap context, as described in the Mycologia paper; neither of these two characters appear to be present here.

To my eye, this mushroom appears to be elongating its stipe so as to get its cap ABOVE the surface of the water. Weird that it hasn’t produced any spore drop though…could it be sterile because it was submerged for too long?

If you were really convinced that this was a rare mushroom, next time I’d advise collecting it, so that its ID can be verified by other means than a photo and water temp graphs.

Still, cool documentation of an interesting mushroom sighting.

near the shallow bank of a stream
By: Dan Molter (shroomydan)
2011-09-01 19:32:31 PDT (-0700)

could mean that it is a normally terrestrial mushroom adapted to a flood plain habitat. I suspect this mushroom began to grow when the stick was partially buried in mud, and then the stick later made its way into the water where the mushroom continued to grow.

Very nice photos BTW.

Doesn’t look much like the type photos
By: Nathan Wilson (nathan)
2011-09-01 18:34:57 PDT (-0700)

The photos published in mycologia show a much paler cap. In addition, as I understand it the mushroom stays underwater for it’s spore dispersal.

Fabulous photos!
By: Dave W (Dave W)
2011-08-19 16:39:05 PDT (-0700)

>50% stipe underwater is crystal clear.

By: Andrew Heath (Quercus)
2011-08-11 08:12:50 PDT (-0700)

Great find!

awesome find!
By: christopher hodge (christopher hodge)
2011-08-10 15:39:07 PDT (-0700)

were the gills slimy? i hear it releases its spores in a mucilaginous mass

Created: 2011-08-09 16:34:51 PDT (-0700)
Last modified: 2011-09-02 13:38:59 PDT (-0700)
Viewed: 524 times, last viewed: 2018-04-08 17:47:28 PDT (-0700)
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