Observation 18597: Tricholoma ustale (Fr.) P. Kumm.
When: 2008-12-31
No herbarium specimen

Notes: Found under live oak, no manzanitae anywhere at all. Surface viscid, taste bitter (really bitter, yucky bitter, no confusion there with “farinaceous”).

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No Cheilocystidia?
By: Michael Wood (mykoweb)
2009-12-11 11:43:56 CST (-0500)

Then its NOT Tricholoma dryophilum.

I have scoped a lot of brown Tricholomas under our local oaks…all have been T. dryophilum, which has cheilocystidia. Neither T. ustale nor T. manzanitae have hymenial cystidia.

Well, take a look at obs. 5746
By: Douglas Smith (douglas)
2009-12-11 03:44:50 CST (-0500)

I went through this two years ago, and I wrote down some notes in obs. 5746.

At the time I created a rough field key to brown Tricholoma for California, and I was hoping to get more obs. in the field make some more sense of them. In doing so I got more questions than answers, and it was assumed by many it seems that the understanding of these is just too up in the air for California, and everything was brought into question. The taste thing, I was told that for these “farinaceous” could be the same as “bitter” depending on the publication. Also there is the endless battle in does “farinaceous” mean “like cucumber” or “like old flour (farina)”.

Anyway, from Shank’s thesis there seemed to be somethings to look for here. Starting with brown colors, white spores, notched attached gills, and viscid cap in California, you get three species: T. dryophilum, T. ustale, and T. manzanitae. The obs. differences in the discriptions were: T. dryophilum has cystidia, and a ixocutis, T. ustale has cystidia and an ixotrichoderm, and T. manzanitae has no cystidia and an ixocutis.

So, I wanted to track this out, and get some observations with good photos, date, location, viscid and taste (use terms bitter, cucumber and farina (like raw cream of wheat)), linked to photos or not of cystidia, and cap surface.

And then I got busy, and more interested in things were I could actually see differences and have better understood taxa than brown Trichs.

But here is a challenge to people for this year. Here I’ve made an obs. of a species with no cystidia and bitter taste. And the only taxon to match this in Shank’s thesis is T. manzanitae. So, someone who still lives there, and decides to care, should get some T. dyrophilum, Trich. that is viscid, under live oak, off-white when young and burried and devel. brown colors in streaks as it breaks through the duff. And get a photo, date, location, and taste it, then get a photo of the gill edge at 400x and see if there are cystidia. And post all that here.

Maybe someone could cross post this challenge to BAMS and Mushroom Talk? I can’t post to those since I moved to Geneva and starting using my new e-mail here…

Doesn’t the bitter taste indicate
By: Ron Pastorino (Ronpast)
2009-12-10 22:36:44 CST (-0500)

Tricholoma ustale, which according to the Shanks’ monograph (and Mykoweb), distinguishes it from T. dryophilum?

So maybe T. dryophilum?
By: Christian (Christian Schwarz)
2009-12-10 16:43:24 CST (-0500)

Created: 2009-02-17 15:00:09 CST (-0500)
Last modified: 2013-03-04 23:08:22 CST (-0500)
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