Observation 67439: Clavariadelphus americanus Methven
When: 2011-05-14
No herbarium specimen

Notes: 10cm high, growing on ground in mixed forest

Proposed Names

44% (2)
Recognized by sight: Sorry, but I have serious doubts about this being pistillaris – and all other american obses for that matter.. Have you checked KOH-reaction?

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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By: Brian Adamo (adamo588)
2011-05-16 14:41:52 CDT (-0400)

Looking at some other photos of these specimens I can see what definitely look like beech leaves – pointed spear-shaped and toothed with prominent straight veins. Bingo!

Agree with
By: damon brunette (damonbrunette)
2011-05-16 14:04:15 CDT (-0400)

birch. Find it in the North woods of Minnesota in the summers there.

The european pistillaris
By: Irene Andersson (irenea)
2011-05-16 14:02:19 CDT (-0400)

is yellow on the hymenium with KOH. In Mushroomexpert is said that it is mycorrhizal with beech, but it’s not that particular about the host. I have seen it in Sweden under oak, and often reported from mixed woods with spruce, aspen and birch.
I don’t know where Kuo got his description from..?

By: Patrick Harvey (pg_harvey)
2011-05-16 13:35:33 CDT (-0400)

Doing a quick search on Mushroomexpert.com, it seems that C. pistillaris has oak or pine for a host, and C. americanus has beech. In the absence of chemical testing, is this the source for your species proposition? Are those beech leaves?
From the same source, both have negative reaction with KOH, so that would not distinguish them.

By: damon brunette (damonbrunette)
2011-05-16 13:13:31 CDT (-0400)

Im no mycologist either, but I wish I would have travelled with my small bottle of KOH years ago. Its not high tech by any means and can make light work out of many ID’s especially boletes. Don’t want anyone reading about chemicals and thinking that its troublesome… thats all.

By: walt sturgeon (Mycowalt)
2011-05-16 10:51:44 CDT (-0400)

Clavariadelphus pistillaris var. americanus Corner

By: Brian Adamo (adamo588)
2011-05-16 10:25:10 CDT (-0400)

Sorry,Irene,I’m no mycologist – just a guy who likes to go hiking and take pictures. It’s fun to try to put a name on all the various mushrooms I find, and share my observations with others. I don’t have any KOH. Lab procedures and chemistry is a bit beyond what I find amusing. If I can’t “best guess” identify a specimen using all the field guides I have, I’ll just post it as “Fungi sp.”. The book I used for this i.d. is “Mushrooms of the Southeastern U.S.”, Bessette/Roody/Dunaway, 2007. Seems to match the picture and description pretty closely except for fruiting date being a bit early. No mention of “americanus” anywhere. Where do these names come from? I would love to know why you think it isn’t pistillaris.

Created: 2011-05-15 22:55:38 CDT (-0400)
Last modified: 2011-05-16 09:56:45 CDT (-0400)
Viewed: 113 times, last viewed: 2016-10-23 11:38:57 CDT (-0400)
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