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Observation 103526: Inocybe sensu lato (Site ID) (Inocybaceae)

When: 2012-07-31

Collection location: Moon Lake State Forest Recreation Area, Pennsylvania, USA [Click for map]

Who: Dave W (Dave W)

No specimen available

This keys out very well as I. fastigiata… except that I believe I found some pleurocystidia. But I could be wrong about the pleurocystidia. Looking for cystidia is a relatively new activity for me. Last photo shows what I believe is a section of a gill.


Proposed Names

58% (1)
Recognized by sight
Based on microscopic features: Bean-shaped spores.
27% (1)
Recognized by sight

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= Current consensus


Add Comment
Thanks Irene.
By: Dave W (Dave W)
2012-08-01 07:34:33 PDT (-0700)

“Smash mount” sounds a lot easier than the “slice on the bias” method I’ve been trying to use to look for cystidia on gill faces. Reading some of the tips for finding cystidia on the gill faces, it seems that there may not be one best method across the board. But smash mount is a good place to begin.

Checking various sources my manuals and online the color gray is generally mentioned as the expectation for I. fastigiata gills, at least during one maturation stage. Kuo says that I. fastigiata and I. obsoleta are possible synonyms, along with a host of other names.

Another feature of this collection that differs from the classic fatsigiata concept is the lack of giant spores (up to 18 mu in one source) in this collection.

Sectioning gills
By: Irene Andersson (irenea)
2012-08-01 00:38:55 PDT (-0700)

is difficult.. You just need to crash mount a gill and press it very thin. Then you will be able to see pleurocystidia through it, if they are there.

Inocybe fastigiata
By: Irene Andersson (irenea)
2012-08-01 00:11:11 PDT (-0700)

(=rimosa) should have distinctly yellowish gills.
Inocybe obsoleta is a similar species (in both macro- and micro characters) with pale greyish gills.