Observation 136409: Panaeolina foenisecii (Pers.) Maire

When: 2013-06-14

Collection location: Hunlock Creek, Pennsylvania, USA [Click for map]

Who: Dave W (Dave W)

No specimen available


Lighting and color contrast contribute to one’s perception of spore print color. Viewed against the black background the brownish tint is best observed in the lower portion of the photo, as the upper portion is a bit washed out from glare. Also, the thickest lines of spores give the best info...

Proposed Names

29% (1)
Recognized by sight: Despite my high level of confidence in the name foenisecii, castaneifolia should be considered. Reports describe foenisecii and castaneifolia as virtually macro-identical.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Thanks Byrain.
By: Dave W (Dave W)
2013-06-16 01:01:11 EDT (-0400)

If there’s still some of these on my lawn tomorrow morning, I’ll scope the spores and post another obs.

By: Byrain
2013-06-16 00:02:23 EDT (-0400)

is also reported as tasting worse, but I think size and taste vary and are subjective. I think the cap striations also can vary, I’m not sure any of these are very definitive. Here is Gerhardt’s key to the genus Panaeolina, he recommends more study needs to be done, which not much has been done since then.

1 Spores normally with 1 to 2 big oildrops (also at
exsiccatum); nearly cosmopolitan species
……………………………….. Panaeolina foenisecii (30)
- Spores normally without oildrops ………………………… 2
2 Breadth of spores not more than 10 Lim, ornamenta
tion like foenisecii; basidia constantly 4-spored; robust
Northamerican species Panaeolina castaneifolia (31)
- Breadth of spores up to 12 Lim, ornamentation more
coarsely as foenisecii; basidia 1- to 4-spored; Indian
species …………………………….. Panaeolina indica (32)

P. castaneifolia is reported as…
By: Dave W (Dave W)
2013-06-15 23:35:43 EDT (-0400)

having a thicker stipe than P. foenisecii. What I have called P. foenisecii occurs on my lawn every June, as long as there is rainfall. I have collected hundreds. I haven’t seen any with unusually thick stipe.

Does an oil drop in the spore indicate one or the other species? This is something I can check with my old beat-up max 400x scope.

I thought the striate cap margins were interesting. That’s why I included the photo showing this feature. But I have observed marginal striations in other types of mushrooms that aren’t reported as having this trait.

Until I run across a thick-stemmed Panaeolina, I’m comfortable with using the name foenisecii for this type.

Why not
By: Byrain
2013-06-15 11:49:29 EDT (-0400)

P. castaneifolia? Does your high vote indicate you have a reason? :)

Do most spores have oil drops or not? How wide are the epicutis cells? 4-spored or 4 & 2-spored? Also, on an interesting side note, Murrill keys Psilocybe foenisecii as “Margin not striate” in Dark-Spored Agarics: V. Psilocybe. The key otherwise doesn’t seem all that useful, nor are the descriptions given.

Created: 2013-06-14 20:11:24 EDT (-0400)
Last modified: 2013-06-27 19:33:02 EDT (-0400)
Viewed: 87 times, last viewed: 2018-01-24 03:08:22 EST (-0500)
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