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When: 2008-02-23

Collection location: NASA Ames Research Center, California, USA [Click for map]

Who: Alan Rockefeller (Alan Rockefeller)

Specimen available

Unpleasant odor, kind of hard to describe, kind of like a rodent cage. Free gill attachment. Interesting notched gill edges, though I was not able to find any cheilocystidia. The stipe has brownish stains and a skirt like annulus. Spores smooth and thick walled.

It was growing near some Juniper bushes in leaf litter on the west end of building N233.


Gill edge, 40x
Basidiole 400x
Pileipellis, 100x
Pileipellis, 100x

Proposed Names

-44% (4)
Recognized by sight: It’s hard to tell for sure from the photos if there’s a volva of any sort, but it looks like there could be. Lepiota sensu lato is possible, but it seems too robust for that and it generally strikes me more as an Amanita. One possibility is Arora’s “Anonymous Amanita” (see Observation 4172).
-75% (4)
Recognized by sight: Is that a rufescent stain I see on the lower part of the cut stipe? The cap color is a little bit unusual but not completely out of whack.
79% (2)
Recognized by sight
Based on microscopic features: Smooth spores
Based on chemical features: Dextrinoid spores

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

= Observer’s choice
= Current consensus


Add Comment
Leucoagaricus sp.
By: Debbie Viess (amanitarita)
2008-02-27 10:37:25 PST (-0800)

Sorry gang, those spores are dextrinoid! No evidence of a universal veil, either. Faked me out too, tho. Thanks to Dimi for pointing me in the right direction. Wishful thinking is a powerful thing! it does explain why the mushroom didn’t appear to be mycorrhizal, tho…duh! it’s a saprobe!

I’m saving it for you, Else!

By: Alan Rockefeller (Alan Rockefeller)
2008-02-26 10:26:45 PST (-0800)

11688 and 11689 were duplicate images. The correct images are 11688 and 11813, both showing the pileipellis at 100x, stained with methylene blue. If you click on the images there are comments on each picture that say what the microscopic ones are, but that are hard to see unless you are looking for them.

base slightly bulbous
By: Alan Rockefeller (Alan Rockefeller)
2008-02-24 11:23:23 PST (-0800)

It has a slightly bulbous base. Growing near a Juniper and an ornamental olive tree with very bitter olives. Roots were seen touching the mycelium, probably from the bitter olive tree.

What about the stipe base?
By: Debbie Viess (amanitarita)
2008-02-23 15:27:46 PST (-0800)

Not clear from the photo, but it looks like Allen’s amanita has a bulbous base; if so, this is not a prairiicola, but may well be one of the non-mycorrhizal lepidellas, which is very cool. ;)
The slightly pigmented, warty cap does fit prairiicola, tho.
Ah, fungal odors…I used to keep mice, and I know just the smell you’re talking about. Yum…

Take us there on a field trip, Allen! We wanna see more! I’ll be down that way tomorrow am…

Amanita sp., section lepidella
By: Debbie Viess (amanitarita)
2008-02-23 09:36:01 PST (-0800)

Rod agrees. Not a novinupta. Most likely an unnamed sp. of lepidella.

Amanita sp.
By: Debbie Viess (amanitarita)
2008-02-23 08:16:00 PST (-0800)

Curious beastie. Pilipelus appears red-brown under the volva, but doesn’t strike me as a novinupta. Perhaps its a member of the lepidella group. With these very fresh specimens, a strong unpleasant odor doesn’t fit our Western Blusher, and the volva at the base doesn’t seem quite right either, tho my collections have shown quite a bit of variability, from a close cup to nothing at all. And under juniper! I will send this link to Rod, perhaps he can make some sense of it. Stick it on the dryer, Alan, if you haven’t already!