Observation 66487: Panaeolus (Fr.) Quél.

When: 2011-04-28

Collection location: Davis, California, USA [Click for map]

Who: Byrain

No specimen available

Growing in grass.


Panaeolina foenisecii on left (observation – 65540) and Panaeolus cinctulus on the right (observation – 66487).
Found shortly after sunrise.
Found shortly after sunrise.
Found shortly after sunrise.
Spore print of the May 14th specimen to ensure its not P. foenisecii.

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Add Comment
By: Douglas Smith (douglas)
2011-04-29 19:20:49 PDT (-0700)

You still need spore photos…

Nice comparison
By: Christian (Christian Schwarz)
2011-04-29 18:22:53 PDT (-0700)

shots for the spore prints.

By: Christian (Christian Schwarz)
2011-04-29 14:50:24 PDT (-0700)

I agree with your notes below, I wish I saw this species more often.
The ones I have seen I wouldn’t confuse with P. foenisecii, but like anything I suppose it is variable.
Variability, I find, is even greater with lawn mushrooms due to the fluctuating environmental conditions.

It would be good to get micro confirmation on a bunch of well-photographed collections to start building more robust ideas about the macro differences.

Macro traits
By: Byrain
2011-04-29 14:01:30 PDT (-0700)

The best way I know to separate both species is the spore color, Panaeolus cinctulus being jet black (Absent of of any brownish tones or light) like a sharpie and Panaeolina foenisecii ranging from clear darker browns to a blackish/brown, but always has some brownish tones.

See the prints in these observations -

Since both species are extremely common here, P. cintulus dominating the long summer while Panaeolina foenisecii more common in the late spring/early summer and late summer/early fall, I have noticed some other more subjective differences. The gills in both species start off light brown with P. cinctulus soon developing blackish hints and then turning jet black in old age or after it finishes spore printing while P. foenisecii progressively turns a deep and dark brown.

As for the stems, P. cintulus stains a deep reddish tones while P. foenisecii a light watery brown, but can develop reddish tones, especially in when wet, but never the same kind of deep reddish staining as P. cintulus. The stem texture is also different, P. cintulus being firmer, but the texture is variable in both species and is not very reliable due to the marginal difference. And of course P. cinctulus somtimes blues a little, usually at the base of the stem. Though have been known to blue a lot sometimes like in this observation -


For the caps, P. foenisecii starts off brown and develops the zonations quickly as it drys, while P. cinctulus starts off with the zonations and looses them quickly as it dries. This leaves the zonations looking slightly different, but is variable and similar enough to leave it not that reliable.

Lastly, as CureCat says, its possible it could be a mixed collection, especially so since the location also has P. foenisecii (http://mushroomobserver.org/64859?q=4Ies). Though, I am fairly confident that is not the case for the reasons above and those CureCat mentioned.

Edited in something about the stems I forgot…

By: Erin Page Blanchard (CureCat)
2011-04-29 13:45:40 PDT (-0700)

Gills and spores appear dark enough for Panaeolus. In the first image the one on its side on the left side is pretty certainly Panaeolus, as well as the mushrooms in the second image… Though the three on the right in the first image have very brown gills, I suspect they are immature. There is always the possibility of a mixed collection but all the spore prints are the same colour, and the brown-gilled ones look otherwise the same as the ones with darker, grey gills.

By: Christian (Christian Schwarz)
2011-04-29 13:17:46 PDT (-0700)

I’m not sure we are correctly separating P. cinctulus and Pa. foenisecii here…
Both get that marginal halo, both have a very dark spore print, one truly black, one often interpreted as black.

P. cinctulus was P. subbalteatus in Demystified, I have found it only two or three times, it is stockier, firm-stipe textured as far as I can tell, and micro differences are pretty obvious if you can get shots of spores.

These are so slender, and the gills appear to be pretty much brown, aren’t they more likely Panaeolina?

By: Byrain
2011-04-29 11:42:52 PDT (-0700)

I’m realizing they aren’t the easiest mushroom to photograph, I had to trim the grass just to set them up like that and I’m still getting used to this camera, I still think there is a lot more I could be doing to get better shots.

Nice photo
By: Christian (Christian Schwarz)
2011-04-28 17:21:31 PDT (-0700)

Those long, skinny stems can be a pain to work with.

Created: 2011-04-28 16:56:34 PDT (-0700)
Last modified: 2018-03-22 16:54:51 PDT (-0700)
Viewed: 526 times, last viewed: 2018-12-24 10:47:53 PST (-0800)
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