Observation 207906: Phylloporus leucomycelinus Singer

When: 2015-06-23

Collection location: Westwood Cemetery, Oberlin, Ohio, USA [Click for map]

Who: peterichards

No specimen available

Michael Kuo’s key to gilled mushrooms has the following somewhat whimsical entry:

41. Mushroom identifier meeting one or more of the following descriptors:
Easily frustrated ~
Without a microscope √
Without access to technical mycological literature somewhat
Just wanted to find a good edible mushroom no
Employed full-time outside of mycology yes

That’s more or less me in this case!

This mushroom has been observed several years in a row at the same locality, on a slight knoll in a century-old (but still active) cemetery under a pointy-leaved oak (black oak group I think). For a long time I thought it was a red-cap phase of Phylloporus rodoxanthus, but it has a brown to olive-brown spore print, depending on the light in which it is viewed. Gills distant or nearly so, not thick, sometimes branching, bluntly attached to stem but not clearly decurrent. Cap velvety, not sticky, usually 3 cm or so across. Mycelium at base of stem white, not yellow. Gills not readily peelable from the cap. Bruising provokes no color change.

Cap reacts strongly with KOH and ammonia, forming a blue-black rim around a somewhat de-pigmented central application region.

What is it?@!

Proposed Names

21% (2)
Recognized by sight

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
By: peterichards
2015-06-27 21:41:35 CDT (-0400)

Thanks for that comment, Dave. I would say that this spore print could not reasonably be considered yellowish-brown – it’s medium brown to dark olive brown. I could take a picture of it, but given how different it looks in different lights, I’m not sure that would be helpful.

I am reasoning starting from P. rodoxanthus as a prototype for Phylloporus generally, and that is risky to be sure. But the fact that the gills do not easily peel away from the cap argues against assignment to Boletaceae, and the non-decurrent gills argue against Phylloporus as described, as does the spore color, though you say one species attributed to Phylloporus apparently has darker spore color.

While I have quite a bit of experience with taxonomy as a one-time Paleozoic invertebrate paleontologist, I am somewhat new to mushroom taxonmy, and I suspect that I am expecting it to be in better shape than it might actually be. Can we not even decide which superfamily a mushroom belongs in without DNA analsis? Apparently, sometimes not!

Appearance strongly suggests Phylloporus to me.
By: Dave W (Dave W)
2015-06-27 21:09:17 CDT (-0400)

A few species I just checked are listed as having yellowish brown spore prints, which does not sound a lot different than the olive brown reported here. Phillips lists P. foliiporus, a species unfamiliar to me, as having (possibly) olive brown spore print.

Why do you think so?
By: peterichards
2015-06-27 20:37:56 CDT (-0400)

It would be useful if the suggestion of Phylloporus were based on some stated criteria, other than visual identification, especially since I offered a number of observations that point away from this identification, one that I offered as my initial conclusion and then dismissed.

Created: 2015-06-27 17:47:32 CDT (-0400)
Last modified: 2015-06-27 21:49:23 CDT (-0400)
Viewed: 59 times, last viewed: 2017-07-08 16:46:27 CDT (-0400)
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