Observation 220302: Phaeolus schweinitzii (Fr.) Pat.
When: 2015-10-22
No herbarium specimen

Notes: Unknown polypore fruiting at the base of large, declining willow. Looks similar to Phaeolus schweinitzii, but I’ve never heard of it on willow. I suppose it could be fruiting on dead wood…any ideas? Thanks!

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By: lightworkerpeace (gsharpnolack)
2015-10-23 15:24:00 CDT (-0400)

I have not observed Phaeolus schweinitzii on Willow. All saprotrophs feed on dead or dying organic matter. Most mycologists will call this species a “pathogen,” and I’m hardly going to argue with that, but I will offer a thought: A pathogen is “a biological agent that causes disease or illness to its host. The term is most often used for agents that disrupt the normal physiology of a multicellular animal or plant.” It should be considered first and foremost a forest cleaner in the sense of breaking down dead wood into soil. It does not possess the characteristic of attacking living trees, but rather dead/dying trees, although all trees have “dead” and dying cells on them. Indirectly, it is a tree killer, a root-rotter, and a legitimate concern for those who manage tree farms, forests, and ecosystems.

Observed on willow before?
By: Andrew (Tenaciousloyd)
2015-10-23 14:01:40 CDT (-0400)

Have you observed Phaeolus schweinitzii occuring on a willow? and if so, is it a pathogen or saprotroph?

Created: 2015-10-23 04:59:42 CDT (-0400)
Last modified: 2015-10-24 01:50:58 CDT (-0400)
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