Observation 116563: Phaeocollybia fallax A.H. Sm.
When: 2012-11-06

Notes: These were rather small. with caps up to 3.4 cm across.
The spores were ~ 8.3-10.0 X 4.8-6.0 microns, with a large beak.
I’m more comfortable calling these Phaeocollybia olivaceus than MO# 116446.
The color and stature are closer to the descriptions and the spores are are a little smaller and closer to the numbers quoted in the USDA reference(“8-11 X 5-6.5”). Admittedly, the spores on these are similar and perhaps on average, a little less mature.

Proposed Names

31% (2)
Recognized by sight
55% (1)
Recognized by sight: Smaller size, olive green cap, gills that have a smoky color to them (P. olivacea_ has pale dingy yellow gills when young) _fallax has violet gills when young that becoming grayish to orangish when mature.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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and it’s Lorelei’s book that provides this data…
By: Debbie Viess (amanitarita)
2012-11-14 09:37:52 EST (-0500)

I hope to be able to score the amended version for less $$$; she might just publish something that fills in the blanks, rather than an entire new book.

The Phaeocollybias are just coming out, so we have the chance to practice our IDs again.

It is really a wonderful book…a wealth of info from all sides: drawings, photos, extensive descriptions, both macro and micro. Gotta love it. If only every American genus had this treatment.

Thanks Noah, my second choice was
By: Ron Pastorino (Ronpast)
2012-11-14 00:07:33 EST (-0500)

P. fallax but the lack of obvious violet gills was a problem. However, everything else is a better fit and these were not young specimens.

Well, I’m never really sure about any Phaeocollybia ID,
By: Ron Pastorino (Ronpast)
2012-11-13 11:48:02 EST (-0500)

and I like to use a more inexpensive reference for the time being…Noah Siegel, who is becoming a Phaeocollybia expert, but is not always readily accessible.
This pair were growing alone and they are kind of small. The caps were viscid and the gills of the smaller one was essentially pallid.
P. olivacea seemed to be the closest match but I’m open to any other suggestion.
In Norvell’s 2010 revised Key, she states that since the publication of the 2008 book, new DNA data indicates that there may be at least 4 new species. Maybe I should wait for the revised edition.

maybe not…
By: Debbie Viess (amanitarita)
2012-11-13 10:40:56 EST (-0500)

did you also find younger material?

Norvell’s book (Phaeocollybia of PNW North America) states that olivacea should have a convex campanulate sticky green cap and pallid to yellowish gills when young.

fruit bodies are densely gregarious, growing in arcs or rings.

the size that you show is at the extreme low end for the sp., which are medium sized not small.

those beaked, turtle-backed spores are found in several other Phaeocollybia species as well.

You should buy this book Ron, you will find it as useful as I do!

Created: 2012-11-13 00:06:55 EST (-0500)
Last modified: 2013-01-01 17:18:24 EST (-0500)
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