Observation 100770: Laccaria Berk. & Broome

When: 2012-07-15

Collection location: Seven Tubs Natural Area, Pennsylvania, USA [Click for map]

Who: Dave W (Dave W)

No specimen available

Proposed Names

58% (1)
Eye3 Eyes3
Recognized by sight: I think these are old darkened L. altaica.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Tough fibrous stem
By: Daniel B. Wheeler (Tuberale)
2012-07-18 13:07:07 CDT (-0400)

certainly suggests Laccaria. I wouldn’t rule out L. amethystina group either. I can see bluing of the stipe, as well as a blue-white tuft of mycelum at the base of the stipe.

The darkness of the fruit body also seems wierd to me.
By: Dave W (Dave W)
2012-07-16 12:51:39 CDT (-0400)

…especially on the gills. Leads one towards Bob’s Gymnopus alkalivirens proposal. But it’s been ridiculously hot and dry around here for the past two weeks, which is about the time these small Lacs started fruiting along Laurel Run Creek. So the ones seen in this obs may have been baking in the heat for awhile.

By: Christian (Christian Schwarz)
2012-07-16 12:44:58 CDT (-0400)

I decided I was just crazy (hence removed comment).

Just not used to seeing such dark Laccaria fruitbodies.

I didn’t get a photo of the spores.
By: Dave W (Dave W)
2012-07-16 12:37:25 CDT (-0400)

But rest assured, Christian, that the spores I found when I mounted the material from the gill were globose, sharp – spiny, and around 8 mu in diameter. I observed at least 20 spores in this way. Many were still stuck to the gill tissue. So I think I can rule out the possibility that some spores from the other collections got mixed in.

This was pretty much the same spore type I observed in the small Laccarias I found in the same area/habitat, except that the spores I examined via print (from the other collections) included a few larger ones… maybe verging on 10 mu. I did not obtain a print for this obs(100770, fruit bodies likely too old), so I don’t know the print color. But since I strongly suspect this is a Laccaria, the print is presumably white.

There were lots of tiny Laccaria all growing in similar mossy habitat along Laurel Run Creek. With the weather so hot and dry here, this was one of the only types of mushroom I found yesterday.

I am not familiar with the genus Alnicola. Just did a quick google, found some info… but didn’t see anything on spore size/shape or print color for any Alnicola species.

No caps with diameter as large as one inch. The diameters in this obs (100770) were a little larger than 1 cm.

Cross section of gill under the scope…
By: Dave W (Dave W)
2012-07-16 07:50:19 CDT (-0400)

showed warty globose spores averaging around 8 mu… over 9 mu, if you count the additional length of the warts. Identical to the spores I examined for several collections of a Laccaria I think may be L. altaica.

This collection actually looks very much like one of Phillips’ photos of L. altaica. But the spores are too small for this species. L. ohiensis is another possibility.

Found in damp moss near a stream.

Created: 2012-07-15 21:05:26 CDT (-0400)
Last modified: 2012-07-16 07:38:27 CDT (-0400)
Viewed: 59 times, last viewed: 2017-06-13 07:56:11 CDT (-0400)
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