Observation 137778: Panaeolina foenisecii (Pers.) Maire

lawn shroom.


smash mount containing immature spores; 400x in water.
look Ma! no oil drops!
note roughened exterior. so fresh, the cytoplasm was still streaming!

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By: Byrain
2013-06-28 09:21:45 PDT (-0700)

I think this is distinction is made in the literature, the key includes the word “normally”, my interpretation is that he meant that the spores will occasionally will/won’t have oil drops, which is what I have also noticed in my own collections. Gerhardt also said the issue needs more investigation and that they are best told apart in direct comparison.

Debbie, also some other differences noted in the literature is the size of the epicutis cells and 4 & 2-spored vs. only 4-spored basidia.

indeed, it raises questions about transient features.
By: Debbie Viess (amanitarita)
2013-06-28 09:10:49 PDT (-0700)

Miraculously, I did get a spore print on this, so we’ll see what fully mature spores look like. I suspect that they won’t show oil drops, though.

Oil droplets
By: Christine Braaten (wintersbefore)
2013-06-28 09:02:11 PDT (-0700)

That’s interesting, if spores do and don’t have them at different stages of development (and the distinction is not made in the literature) then oil droplets might not be a very useful character. Also, I wonder if the retention of oil droplets in spores are affected by age of herbarium material (for example, do spores that are 100 years old behave the same under the microscope as spores that were taken from a mushroom that was picked yesterday?) Nice pictures Debbie!

some immature spores from smash mount…
By: Debbie Viess (amanitarita)
2013-06-28 08:52:18 PDT (-0700)

contain oil drops, but mature spores do not. I am attempting a spore print, but with this heat…

thanks Byrain…
By: Debbie Viess (amanitarita)
2013-06-27 10:14:17 PDT (-0700)

a kindly way to say that there may be a cryptic species in that group!

I will throw it under the scope (vs the bus) later today.

By: Byrain
2013-06-27 09:59:15 PDT (-0700)

Here is a Panaeolina key you can try from Gerhardt’s Panaeolus book.

“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)”

Material that keys to P. canstaneifolia is common in California, see observation 114763 and observation 90428. I make no claims as to what that means…

Created: 2013-06-27 09:47:22 PDT (-0700)
Last modified: 2013-06-27 09:53:14 PDT (-0700)
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