When: 2008-11-21

Collection location: New York, New York, USA [Click for map]

Who: helmet_hair

No specimen available

Spore shape and size fits Pleurotus sp. but the ornamentation and spore deposit color fits Lentinellus sp. This one has really stumped me!!

[admin – Sat Aug 14 02:03:47 +0000 2010]: Changed location name from ‘New York, New York’ to ‘New York, New York, USA’

Species Lists


This is a Russula sp. used to compare spore ornamentation to unknown.
This is a Laccaria sp. used to compare spore ornamentation to unknown.

Proposed Names

0% (4)
Recognized by sight: Pileus size- 2 – 5cm
Margin- Inrolled
Stipe- absent or short
Gills- Decurant…ragged edges in areas; 3 tier
Spore Deposit- White
Growing out from the heart wood of Ailanthus
Based on microscopic features: Spores- on average 11×4 micrometers; subfusiform; ornamented with amyloid spines
60% (2)
Recognized by sight: Usually smaller and in smaller groups than ostreatus, white, often drying yellowish, spore deposit white to cream -
and check this photo of Pleurotus-spores:

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= Observer’s choice
= Current consensus


Add Comment
By: Darvin DeShazer (darv)
2008-11-28 14:04:08 CST (+0800)

The spores can NOT be amyloid for Pleurotus. The best way to tell is make a spore print on a glass slide then add one drop of Melzers. The blue should be visible without magnification.

Thanks Irenea, The link you posted for the spore did not work. Dan
By: helmet_hair
2008-11-28 09:25:20 CST (+0800)
good advice all
By: helmet_hair
2008-11-27 05:04:35 CST (+0800)

I have uploaded 2 pictures of spiny spore sp. that I have in my collection, Laccaria and Russula sp. When comparing the known spiny spore ornamentation of these 2 species to my unknown, I would say they are similar wouldn’t you guys? Maybe the best description that I find for the unknown spore ornamentation is Verrucose (Largents book). After saying all this it is true that the shape and size of the unknown best fit Pleurotus sp. Weird!
Thanks, Dan

You could try looking at spiny spores to compare
By: Douglas Smith (douglas)
2008-11-27 03:23:18 CST (+0800)

Try looking at the spores of a species that is spiny to compare and see how it goes. Question is which one is a good example… Crepidotus applanatus, or C. crocophyllus… but you might not be able to id those until you look at the spores. Naucoria is spiny, but those can be hard to find…

Maybe compare to a Russula, the more warty ones are fairly spiny. Or Laccaria are nice and warty to kinda spiny, and those are really common, and easy enough to id the genus.

So, if you see one that you know is spiny, then you can compare what those look like through your scope with these to see if you can tell if these are really spiny.

I think Pleurotus too
By: Irene Andersson (irenea)
2008-11-27 02:55:52 CST (+0800)

The size and shape of the spores do not fit any Lentinellus, neither are the gills distinctly serrulate.
Pleurotus spores aren’t described as spiny, but I wouldn’t call these spores spiny either.

By: helmet_hair
2008-11-27 00:41:57 CST (+0800)

Thanks Alan. Have you ever seen Pleurotus sp. spores other then smooth? I believe the spores I collected are spiny.

I’m going with pleurotus sp.
By: helmet_hair
2008-11-23 23:58:53 CST (+0800)