Observation 64397: Conocybe Fayod

When: 2011-03-15

Collection location: Bon Tempe Reservoir, Marin Co., California, USA [Click for map]

Who: Ron Pastorino (Ronpast)

No specimen available

These were growing on the ground near redwoods.
The caps were only up to 2.2 cm across, very fragile, translucent striate and hygrophanous.
The gills were adnexed and stayed a yellow brown.
The stem was smooth, fairly fragile and hollow.
The spore print was a reddish brown and the spores were large, ~ 13.0-14.7 X 8.0-9.5 microns, smooth, with a large germ pore.
Did not see any cheilocystidia and I included a couple of micro photos of what might be pleurocystidia.


Spores in KOH
Pluerocystidia(?) in Congo Red
Pleurocystidia(?) in Congo Red
Stipe edge in Congo Red

Proposed Names

2% (2)
Recognized by sight
5% (2)
Recognized by sight
Based on microscopic features: Spore size, shape and pore matches
78% (2)
Based on microscopic features: The lecythiform (bowling pin shaped) cystidia seen clearly in the last image.

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

= Observer’s choice
= Current consensus


Add Comment
Thanks Alan for the digital spore measurements
By: Ron Pastorino (Ronpast)
2011-03-16 17:07:03 PDT (-0700)

I’ve added a photo of what I typically am seeing with my attempt to look for Caulocystidia. The upper right quadrant should represent a vertical portion of the stipe edge from the upper end of the stem. I got the same results from a section of both stems. No cystidia found?
However, I had to retrieve the stipes from my waste basket and they were not in the best of shape and had been handled a bit. Another problem is my lack of experience(none) in trying to find Caulocystidia. Also the specimens may have been too far gone to make a reliable conclusion.

Spore size
By: Alan Rockefeller (Alan Rockefeller)
2011-03-16 15:57:02 PDT (-0700)

The new spore pic has a scale of 34.3 pixles per micrometer.

476.2 / .343
283.3 / .343

(Boring math removed)

$ cat spores | sort -n
12.62 × 8.22
12.79 × 8.48
13.49 × 8.42
13.67 × 8.45
13.88 × 8.25
14.02 × 8.77
14.34 × 9.18

Looks like Ron’s original measurements were pretty good.

I usually measure 30 spores and drop the two highest and two lowest numbers.

Since there are less than 30 spores I won’t drop any, and I am lowering my confidence on C. tenera to Could Be in light of the new spore picture.

Ron it would be great if you could make those caulocystidia pics.

By: Alan Rockefeller (Alan Rockefeller)
2011-03-16 14:42:38 PDT (-0700)

Zooming in the camera will not affect the spore measurements as long as the reticle scale is visible and the pixels per micrometer value is recalculated for each picture.

Actual spore measurements based on my photos
By: Ron Pastorino (Ronpast)
2011-03-16 08:56:10 PDT (-0700)

may not always be accurate. I’m not sure what the effect of zooming in with the camera (to get a better picture) does to the relationship of the spore size to the reticle scale. It
should be OK to get a Q value for the spores but I’m not sure one can rely on it for specific measurements. I added another spore photo that wasn’t zoomed in quite as close.
Doug, I didn’t save the stipe but I’ll try to dig it out and see if there is enough to salvage for further testing.

Need caulocystidia.
By: Douglas Smith (douglas)
2011-03-16 00:29:51 PDT (-0700)

Ron – really need the caulocystidia from the upper stipe to get anywhere here. Not too near the gill attachment, you always find some cheilocystidia running a couple mm down the stipe there. Just a small cut of some stipe near the cap margin, and squashed, should get you plenty of caulocystidia.

Microscopic features
By: Alan Rockefeller (Alan Rockefeller)
2011-03-16 00:09:51 PDT (-0700)

If you measure the spores instead of taking Ron’s word for it you will find that all of the pictured spores are within the range of C. tenera.

270 / 33.6 (his image has 33.6 pixels per micrometer)
281 / 33.6
267 / 33.6
280 / 33.6
271 / 33.6
283 / 33.6
272 / 33.6

By: Erin Page Blanchard (CureCat)
2011-03-15 23:06:49 PDT (-0700)

Spore width is outside the upper range for C. tenera.

Created: 2011-03-15 20:51:30 PDT (-0700)
Last modified: 2011-03-17 12:33:19 PDT (-0700)
Viewed: 142 times, last viewed: 2019-08-28 12:03:54 PDT (-0700)
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