Observation 134006: Inocybe insinuata Kauffman

These little guys were found growing on the ground under conifers @ ` 6000 ft.
Largest cap was 14 mm across.
Initially i thought they were some small puff ball but looking closer(with glasses), one could see a cap and stem covered with a thin veil. After an overnight rest on a wet towel, white shallow, adnate gills did appear, and a residual thin line of veil fragments just above a small bulb.
They were dried and today I took some gill sections and tried to examine them in Melzers and Congo Red.(See Photos).
The spores appeared to be a yellow-brown in Melzers and had oil droplets in Congo Red. The measured ~ 7.8-10.0 X 4.9-6.3 microns with an elongated, smooth egg-shape.
They had a substantial amount of cheilocystidia that was utriform with crystals.
Could use some suggestions……?


Spores in Melzers @ 1000X.
Cheilocystidia in Congo re @ 1000X.
Cheilocystidia in Congo red @ 1000X.
Cheilocystidia in Melzers @ 1000X.
Cheilocystidia in Congo red @ 1000X.
Spores in Congo red @ 1000X.

Proposed Names

31% (2)
Recognized by sight
43% (3)
Based on microscopic features: cystidia with crystals at the apex, smooth spores with no germ pore

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

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
At this point, Inocybe insinuate seems relatively reasonable.
By: Ron Pastorino (Ronpast)
2013-05-20 23:55:31 EDT (-0400)

These were obviously just reaching puberty and the description it appears, is based on only one collection.
They were so small that it was difficult to even get a good gill section…at least for me and my limited experience. The gills were very shallow and I basically considered the cystidia I saw to be primarily Cheilocystidia, which measured in the 50-55 X 15-17 micron range. Not exactly a solid match with the official description, but perhaps close enough for what has been done so far with the species.

didja measure the cystidia?
By: Debbie Viess (amanitarita)
2013-05-20 16:47:06 EDT (-0400)

according to the Kuo key, I. insinuata has scattered (not abundant) thin-walled pleurocystidia, longer than 55 µ. Your spores are also within the range of that species; the short stipe is, too.

By: Douglas Smith (douglas)
2013-05-20 15:41:23 EDT (-0400)

You can take a look at this obs.:


And the disc. there.

By: Christian (Christian Schwarz)
2013-05-20 11:43:30 EDT (-0400)

I came up with that name from having read through descriptions of species described from California, I think that name came from a collection made with pines at UC Berkeley. I was considering applying that name to some of my collections, so it’s been on my mind.

Christian, how did you come up with that
By: Ron Pastorino (Ronpast)
2013-05-19 22:42:45 EDT (-0400)

obscure name “Inocybe insinuata” so quickly?
And you managed to under state your confidence level even below mine??
It didn’t feel like an Inocybe but the spores and cystidia certainly point in that direction.

Created: 2013-05-19 17:28:43 EDT (-0400)
Last modified: 2013-05-20 16:47:34 EDT (-0400)
Viewed: 132 times, last viewed: 2017-12-08 19:24:14 EST (-0500)
Show Log