Observation 44737: Tricholoma (Fr.) Staude

When: 2010-04-23

Collection location: Bolinas Ridge, Marin Co., California, USA [Click for map]

Who: Ron Pastorino (Ronpast)

No specimen available

This lone specimen was growing on the side of a bank under redwood.
The cap was about 3.8 cm across, dry and inturned.
The gills adnexed/notched.
The white spores were not amyloid and measured about 7.8-8.9 X 6.0-7.0 microns and rather roundish.
The photos of the gill edges I believe show pultruding basidia and perhaps some cystidia or basidioles.
I thought they might have a slightly bleachy odor?



Proposed Names

-10% (2)
Recognized by sight
30% (2)
Recognized by sight
1% (2)
Based on chemical features: Spores look slightly dextrinoid.
28% (1)
Recognized by sight: Distant, notched gills,
Used references: Meinhard Moser,
Based on microscopic features: spores 8-10/4-5.5
Based on chemical features: Bleach like odor
28% (1)
Recognized by sight

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

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Well, the spectrum of possibilities
By: Ron Pastorino (Ronpast)
2010-04-28 04:34:11 CEST (+0200)

seems to have been covered.
Thanks for all your well thought out and researched considerations, especially Johann’s. Unfortunately there was only one specimen and that usually is not enough to get me to spend a lot of time trying to figure out an ID. But we are in a fungally slow period in this area and I appreciate the interest.

By: Johannes Harnisch (Johann Harnisch)
2010-04-28 03:51:45 CEST (+0200)
First of all there is only on specimen which makes it difficult to ID (or was there more?).

Collybia maculata also has spores 5-11×4-6, according to Arora “at least a few are dextrinoid” gills also notched/free.

But that species has (very)crowded gills as apposed to this Observation which has well spaced gills, and spores 4-6 X 3-5 according to Roger Phillips,

So I would say Rhodocollybia maculata is out. perhaps another Collybia sp…

Lyophyllum species often either bruising/staining or growing in clusters/clumps. can’t seem to find any Lyophyllum sp that would fit. though I must say it does look a little like one, do any grow under redwood?

Hygrophorus species gills often decurrent, (Basidia 5-6 times as long as spores. according to Moser)Hygrophorus deosen’t seem to fit, though it does look a little like one at first glance.

Tricholoma Lemellae concave or rounded, not hygrophanous, spores not amyloid acyanophilous or weakly cyanophilous,

I can’t quite rule Tricholoma out either,

Tricholoma inamoenum is one guess of mine because of the markedly distant, notched gills, bleachy odor (could that be similar to illuminating gas odor?) spores 6-7/4-5.5….Cap 3-7 cm wide,
(I think I have found this species before…)

greasy looking cap…
By: Debbie Viess (amanitarita)
2010-04-27 20:02:08 CEST (+0200)

fits with Lyophyllum, too. but the spore size is problematic…

The white spores were stained with Congo red
By: Ron Pastorino (Ronpast)
2010-04-27 17:35:39 CEST (+0200)

so the color doesn’t mean much in the photos.
Lyophyllum could also be a possibility. I initially went with Hygrocybe because of the rather thick waxy gills and the habitat (redwood) but the notched gills were problematical.

With notched gills
By: Irene Andersson (irenea)
2010-04-27 08:29:13 CEST (+0200)

and rounded spores I couldn’t rule out Tricholoma. It reminded me a bit of a small saponaceum, but the spore size doesn’t fit.

If the spots on the cap are blackening wounds, it may also be a Lyophyllum.

The divisions on the microscope photos
By: Ron Pastorino (Ronpast)
2010-04-26 15:58:37 CEST (+0200)

are in microns.
And Irene, what characteristic(s) indicated Tricholoma for you?

what is the scale
By: Johannes Harnisch (Johann Harnisch)
2010-04-26 03:50:06 CEST (+0200)

on the scope pics microns>? or millimeters?

Created: 2010-04-26 03:22:50 CEST (+0200)
Last modified: 2017-12-28 01:13:49 CET (+0100)
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