When: 2009-02-17

Collection location: San Pablo Reservoir, Contra Costa Co., California, USA [Click for map]

Who: Richard Sullivan (enchplant)

No specimen available

I really don’t have a clue what this is. It was less than a centimeter across. There were a few of them growing solitarily in moss about 1 -2m above the ground on old valley oaks. I though rimbachia but it has a stipe and it is brown. Not a Crepidotus. Doubtless it is common as mud and someone will know it straight away and save me from endless keys!

Species Lists


spores that seem irregular and white
These pictures show the dried specimen reviving in 10 minutes with 2 drops of water. Clearly pretty handy if you are high up on an oak tree trunk where you dry out .
These pictures show the dried specimen reviving in 10 minutes with 2 drops of water. Clearly pretty handy if you are high up on an oak tree trunk where you dry out .
These little branching hairs were along the stem
These are the little branching hairs that extend out from the stipe, and they seemed to have a cluster of the spores stuck to them 400x
The hairs on the stipe at 100x
The long hairs on the stipe at 400x

Proposed Names

1% (2)
Recognized by sight
28% (1)
Recognized by sight
28% (1)
Recognized by sight: spore print is white, revives to full size from dry in 10 minutes
28% (1)
Recognized by sight
78% (1)
Recognized by sight
Based on microscopic features

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

= Observer’s choice
= Current consensus


Add Comment
Thanks so much, Dimitar
By: Richard Sullivan (enchplant)
2009-02-26 03:13:11 CET (+0100)

I am so pleased with the effort you put into this tiny specimen. I learned a great deal about what to be looking for in future. I need a real microscope and a lot of practice! Thanks so much.

I’m sure I’ll see Lichenomphalia on many more trees now that I know what it is called.
Lichenomphalia sp.
By: Dimitar Bojantchev (dimitar)
2009-02-26 02:36:49 CET (+0100)

We looked at the collection this afternoon. it is definitely in the Lichenomphalia group. Lo. umbelifera is the main possibility. The spores were a little smaller than typically reported for Lo. umbelifera, but they may have not been mature either because they were not collected naturally by free falling. Frequently applied synonyms are Omphalina ericetorum, Gerronema ericetorum, Phytoconis ericetorum. The spores were mainly broadly ellipsoid to subglobose: 6-7×5-6.3µ. No cystidia was observed after several detailed inspections. Slender basidia -2 and -4 spored without clamps: 37-50×6-7µ. Clamps frequent elsewhere.

Applying specific epithet will take me some time to review the literature.

Will post micro-pictures later.


Thanks Dimitar
By: Richard Sullivan (enchplant)
2009-02-25 02:17:17 CET (+0100)

Thank you so much for that kind offer. I’d be pleased to take you up on it. I’ll contact you directly.

Good points for trying! Not so good for technique and quality of output.
By: Dimitar Bojantchev (dimitar)
2009-02-25 01:32:44 CET (+0100)

Richard, this is an interesting mushroom that deserves the love and
attention you’re giving it. If you permit me to suggest, what your
problem at the moment is the lack of technique to really see better
the micro structures. Your photographs show absolutely nothing that can
be discerned as anything. If you come by the Bay Area, you can stop by my
place and we will look at it together. I am convinced that we will
quickly put an id. I am very willing to help because you show
great desire and persistence.

Best wishes,

I’m still trying!
By: Richard Sullivan (enchplant)
2009-02-25 01:16:16 CET (+0100)

I am still really keen to find out what this is. Iknow it is not the most exciting mushroom in the world but it’s habitat is really distinctive. I’ve found it several times in the moss on deciduous oaks and Acer macrophyllum. So I examined the stipe under the microscope and found many long cellular hairs that extend out from the surface. These don’t look like the caulocystidia that Dimitar mentions on his website under Xeromphalina (http://mushroomhobby.com/...), which seems to look the most like this mushroom. And of course the spore shape seems inconsistent. I will keep on trying!

Oh, you’ve kept going with this one, good for you -
By: Douglas Smith (douglas)
2009-02-22 22:41:06 CET (+0100)

If that first photo is of the gill edge, that looks like lots of basidia, not cystidia. That is what you usually see on a gill edge, that forest of basidia. If you want to see better, I always thought for people that want to try more, we should have a set of stuff to go try and find, and look for these things. Like some common enough species with good easy to see cystidia, and you can use those for comparison. I always doing that, going to some other mushroom, to see the difference, so I can understand what I am looking at.

Anyway, not sure here. The spores look pretty small? They actually look rather nodulose/irregular, not exactly smooth. What the spore print really white? Not pinkish, or creamy, or something other than really white?

Still not sure what they are. With little guys like this, it might take awhile, and not really get you anywhere, since they might not be well described yet also. You will need more than the spores with of the beaten path stuff, another these guys can be more interesting… If it is Marasmius, you also need the quality of the cap surface, get a thin section and look at the cap surface (I’m not sure this one really looks like Marasmius…) And don’t forget the stipe surface, and if that has cystidia also…

Now a good common guy to look for cystidia?

some new things I see.
By: Richard Sullivan (enchplant)
2009-02-22 18:18:42 CET (+0100)

Spores are white and irregular. Under the microscope there seem to be abundant cheilocystidia, although I’m not very experienced with microscopy. I had a dried specimen which was shriveled and less than 1 cm. in diameter. With a few drops of water it swelled to 2 cm. in 5-10 minutes.

not Contumyces rosella… no pink marginate gills.
By: Debbie Viess (amanitarita)
2009-02-22 18:08:01 CET (+0100)
Thanks Douglas
By: Richard Sullivan (enchplant)
2009-02-17 21:39:23 CET (+0100)

Thanks for pointing me in the right direction. As for a spore print, I felt it was pointless as the poor creature had been so deluged by the rain that it would be hard to find a spore let alone a print. I can check it the next day I’m in the area.

Spore color?
By: Douglas Smith (douglas)
2009-02-17 19:27:21 CET (+0100)

Well, to save you from the endless keys, you did take a spore print, did you not?
Try Omphalina also…