Observation 6950: Helvella acetabulum (L.) Quél.
When: 2008-02-29
No herbarium specimen

Proposed Names

75% (3)
Eye3 Eyes3
Recognized by sight
-36% (3)
Recognized by sight: I exchanged a bit of email with Darvin and he thought this was a likely alternative and will try to collect it and have a closer look.

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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On the other hand…
By: Darvin DeShazer (darv)
2008-03-02 10:41:27 EST (-0500)

Just to clarify: The second sighting (Observation 6954) was in Sebastopol, about 15 miles from Petaluma. Two observations were found with flat, torn discs. Both had the typical cup-shape near them.

On the other hand…
By: Nathan Wilson (nathan)
2008-03-02 00:01:39 EST (-0500)

I just saw Observation 6954 which Darvin says was growing in the same area and that is definitely H. acetabulum. Guess I’ll update my votes after I finish this crow.

I think this needs a scope…
By: Nathan Wilson (nathan)
2008-03-01 23:50:13 EST (-0500)

I had also considered Discina perlata, but based on the description in Arora I eliminated it. In particular, it doesn’t have a smooth exterior and it’s not a “snowbank” fungus. I have seen this species in the Sierra and the underside of this collection does not fit my concept of that species. For Disciotis venosa , on the other hand, the exterior is described as being “often fluted or wrinkled at base to form a short stalk”. I take this to mean something similar to H. acetabulum. It is also described as having an upper surface that is wrinkled and a margin that is “often wavy and/or splitting” both of these fit the first photo. I have never seen H. acetabulum with an uneven fertile surface like this has and while the margin may split it still has a reasonably clear round shape. However, a good look at the spores should solve all this once and for all: no droplets → Disciotis venosa; spindle-shaped with an apiculus, one large oil droplet and two or more smaller ones at the ends → Discina perlata; elliptical and a single oil droplet → H. acetabulum.

I don’t know about Disciotis
By: Douglas Smith (douglas)
2008-03-01 19:30:11 EST (-0500)

Not that I know much here, but did that ever stop me before? But I thought Disciotis was a relative of Morchella, and will have a wrinkled fertile surface, Arora I believe has notes to that effect. For a flat brown asci, I would think they look more like Discina perlata. But as a conservative guess I’d go with H. acetabulum also.

Never seen it flatten out like that…
By: Nathan Wilson (nathan)
2008-03-01 01:40:24 EST (-0500)

In my experience Helvella acetabulum is always more cup like than these, but it may be that I’ve never seen older ones. I think I would have called it Disciotis venosa, but I can see why it might be H. acetabulum.

Created: 2008-02-29 22:23:29 EST (-0500)
Last modified: 2008-02-29 22:23:29 EST (-0500)
Viewed: 15 times, last viewed: 2016-03-20 12:46:16 EDT (-0400)