When: 2007-06-28

Collection location: Interurban Trail, Seattle, King Co., Washington, USA [Click for map]

Who: Luke Bayler (Matango)

Specimen available

clustered in grass

pileus: 27 mm diam, 6 mm height, viscid and shiny when wet, bicolorous, disc darker, disc 10 mm

trama: 1 mm at disc, thinning along margin towards margin edge

lamellae: 13 mm long, 5 mm tall, darken with age, with lamellulae

stipe: 60 mm long, 3 mm wide, equal with slightly bulbous base, hollow and fibrous, darkening from the bottom, but this may be due to pinching the stipe while harvesting

spp: purple-black

[admin – Sat Aug 14 02:03:52 +0000 2010]: Changed location name from ‘North Seattle Interurban Trail, Seattle, WA’ to ‘North Seattle Interurban Trail, Seattle, Washington, USA’


Proposed Names

61% (2)
Recognized by sight: Probably Panaeolina foenisecii due to the thin white stem and brownish gills and purple-black spore print. The cap does look more gray them most other foenisecii samples though. Stem seems a little thin for Panaeolina castaneifolia which is supposed to have a stem that is 4 – 6 mm.
Used references: Original description by Murrill in 1923 as Psilocybe castaneifolia:

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= Observer’s choice
= Current consensus


Add Comment
Dark walnut purplish brown
By: Alan Rockefeller (Alan Rockefeller)
2008-08-04 16:16:32 MST (-0700)

The spore print color of Panaeolina foenisecii is dark walnut purplish brown, it is similar but very different then the jet black prints found in Panaeolus. If there is any hint of purplish brown it will be a Panaeolina.

See this spore color comparison.

I will be on the lookout for these.

What is meant by spores dark brownish?
By: Douglas Smith (douglas)
2008-08-04 14:16:54 MST (-0700)

You mention spore dark brownish, but you don’t mention what that might mean? I’ve found that the spore print for P. foenisecii is black. Black with maybe hints of brown in really bright light. For some reason this seems to have come from A. H. Smith monograph as chocolate brown, and in field guides this got listed as brown. But it is pretty black.

But with these little Panaeolina/Psathyrella-ish guys, just taking a photo we can argue forever on what is might be. We really need to have more observations of these guy with good photos linked to photos of spores and if the spore print color is going to sighted, to the spore print also. I tried to do this with one observation no. 7372.

If it is Panaeolina the only way to tell is with a quick look at the spores, which can be from the gill if you want. If it is warted at all, it is Panaeolina, if not then it is Panaeolus or Psathyrella. (If it looks like this.) Without this we can just keep arguing…

But seriously, given how common these little guys are in the grass, I’d like to see more good photos like these, that are linked to a photo of the spores. So, maybe with a collection of these we can start to see differences between Psathyrella and Panaeolina macroscopically. I was going to try and do this, but everything I’ve looked at, has all been Panaeolina. We need more diversity in the lawns of Mountain View…

P. olivaceus
By: Workman
2008-08-04 12:48:56 MST (-0700)

If the spores are black and not dark brownish, the species is more likely Panaeolus olivaceus aka (Panaeolus castaneifolius sensu Ola’h). Panaeolina castaneifolia has dark brown spores in deposit.

RE: Should this be Panaeolina castaneifolia rather than Panaeolina castaneifolius?
By: Luke Bayler (Matango)
2007-07-03 23:55:11 MST (-0700)

I got name from Psilocybin Mushrooms of the World, the Stamets book. I will go with the name you suggested as it is the one from indexfungorum.org. Thanks!

Should this be Panaeolina castaneifolia rather than Panaeolina castaneifolius?
By: Nathan Wilson (nathan)
2007-07-03 21:14:19 MST (-0700)

According to Index Fungorum it should be one of:

Panaeolina castaneifolia (Murrill) Bon (1979)
Panaeolina castaneifolia (Murrill) Ew. Gerhardt (1996)

A quick Google search turns up a more hits (47) for Panaeolina castaneifolius than for Panaeolina castaneifolia (10), but I don’t see why the gender would change with the transfer from the original name, Psilocybe castaneifolia. Where did you find the name?