Observation 447667: Rhizocybe Vizzini et al.

Under pine; smell not really distinct, but somewhat sulfurous and farinaceous; attached firmly to substrate; gills white initially, then yellowing in age. Spores tiny, cylindrical/ellipsoid, hyaline, cystidia absent or nondistinctive


Spores in KOH

Proposed Names

29% (1)
Recognized by sight
-48% (2)
Recognized by sight
Based on microscopic features: Tiny spores, lack of hymenial cystidia
-30% (2)
Recognized by sight
Based on microscopic features
-15% (3)
Recognized by sight: Brown cap, yellow gills with age, under conifer
Based on microscopic features: Hyaline spores, absent cystidia
Based on chemical features: No distinctive smell
8% (2)
Recognized by sight
Based on microscopic features
46% (2)
Recognized by sight
Used references

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= Observer’s choice
= Current consensus


Add Comment
By: Excited delirium [EXD]▼ (Excited delirium [EXD]▼)
2021-04-21 09:29:48 PDT (-0700)

First, at Dave W.: You may benefit greatly by emailing Alan Rockefeller and ask if he is able to sequence a collection or two. He’s into it, so it’s probably a green light.

Second, at Chris C.: I would do two things in addition to sequencing, and you probably plan to do this already. First, see if you can find two more separate collections of this species for study -- and go DEEP with the macro- and micro-photography. Second, go DEEP on the description(s) in terms of writing them up in your observations of this particular species. It may also benefit you to send correspondence to Vellinga and Redhead, and ask for a hint or two.

Well, at $25-$40…
By: Dave W (Dave W)
2021-04-21 09:13:02 PDT (-0700)

for a single sequence, submission can get expensive if (like me) you bring home lots of different fungal collections. In 2018 I obtained a North American Mycoflora grant for our local club (basically me) to submit 30 collections for sequencing. I applied again this year (now called Fungal Distribution Survey) and I am told that I’ll have another batch of sequences funded. But, the hardware necessary for the methods favored by FunDis will likely not arrive for over a month. FunDis recommends preserving fresh material in a gel they provide in test tubes. I suppose I could submit dried material inside a tube/gel. But I prefer to try to follow the recommended directions.

Why don’t you two
By: Dušan (RenegadeMycologist)
2021-04-21 07:51:09 PDT (-0700)

Sequence your mushrooms and compare the results with each other; even if it doesn’t hit anything else from the database maybe they will match with each other – if they are really closely related (same sp or genera).
Dave’s mushroom is probably “Rhizocybe”, this one I’m not so sure, cap is completely wrong, and so are the gills.

Just an idea from a mycology noob, feel free to ignore.

Yeah, somewhat different morphology…
By: Dave W (Dave W)
2021-04-21 07:28:33 PDT (-0700)

possibly distinguishes 447667 and 451867 as different species. On the other hand, for a really early-occurring type of mushroom I think significant variability in temperature may correlate with variability of traits like color, length of stipe. On 451867 the smaller one has gills that are not decurrent. On this observation (447667) the tall thinner one has gills that appear to be verging on decurrent.

I agree
By: Chris Cassidy (cmcassidy)
2021-04-21 06:35:46 PDT (-0700)

However I’m not convinced these are the same taxon. Your collection has different gills and cap, but I do believe this may be Rhizocybe or similar. Having a hard time pinning this one down, and Rhizocybe is the closest match, macroscopically and micro-wise as well.

Reasonably good match…
By: Dave W (Dave W)
2021-04-21 05:12:40 PDT (-0700)

for obs 451867 , including reported microscopic traits.