Observation 97586: Agaricus placomyces Peck

When: 2012-06-16

Collection location: Rock Island State Park, Warren Co., Tennessee, USA [Click for map]

35.8° -85.6346° 274m

Who: Christine Braaten (wintersbefore)

No specimen available

On soil under hardwoods

Proposed Names

28% (1)
Recognized by sight
52% (5)
Recognized by sight
8% (3)
Recognized by sight

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
By: Steve Roberts (Mushroom World)
2012-06-20 00:01:31 CDT (-0500)

That’s good to know, that A. placomyces is found as far south as Texas. That sure changes that part of the equation! What about the base? My pictures shows what looks like a small, abrupt bulb, that is somewhat camouflaged by surrounding dirt. Kuo says A. pocillator has an abrupt bulb and A. placomyces lacks it.

Nice research, Christine
By: Martin Livezey (MLivezey)
2012-06-19 16:55:08 CDT (-0500)

Based on my limited observations in the field, A. placomyces is a species complex. They all look similar and yet distinct – finely drawn. I don’t have confidence that they are all the same. But for now, for me, it is handy to ‘slap that name on them’. The differences could be due to age: pink to brown gills, interesting veil, interesting pattern of markings on the cap. Do microscopic features clarify these differences?

Agaricus placomyces
By: Christine Braaten (wintersbefore)
2012-06-19 16:15:19 CDT (-0500)

The UT herbarium has 30 specimens of A. placomyces, all from Tennessee and North Carolina (and one from Texas) compared to only 12 specimens of A pocillator (some from Tennessee, but many from more southern states like Florida and Alabama). Macroscopically, I think this observation bears more resemblance to A. placomyces, and it does appear, at least from its representation in our herbarium, that this species is somewhat more common here as well.

update: spore measurements and some comments
By: Steve Roberts (Mushroom World)
2012-06-19 14:35:31 CDT (-0500)

spores 5 – 6.5 × 3 – 4 um spores, a bit narrower than A. placomyces
Also, A. Placomyces is a more northern species
I’m not sure how far south it goes, but that would be interesting to know

Thanks Martin!
By: Christine Braaten (wintersbefore)
2012-06-17 09:57:53 CDT (-0500)

A. placomyces seams to fit.

Created: 2012-06-16 22:26:35 CDT (-0500)
Last modified: 2012-06-20 00:13:09 CDT (-0500)
Viewed: 120 times, last viewed: 2017-12-12 16:58:26 CST (-0600)
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