The gray horizon has been leached of iron and humic acids, which have been deposited in the middle of the profile
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That’s what Matsutake grow in, one of the key identifiers for Tricholoma murillianum is that the base of the stem will be covered in podzol.
I had to do a bit of googling to figure out what you were talking about, but I’m glad I did. I’m not a mushroom guy at all.
Podzol isnt the best term for what you’re describing, if I’m splitting hairs. What you’re talking about (the gray horizon) is referred to as an eluvial (leached) horizon. All podzols have them, but not all soils that have eluvial horizons are podzols, if that makes sense.
Brunisolic/spodsolic orders, for instance, have subgroups that have eluvial horizons, but they don’t meet the criteria of podzols. Similarly, Luvisols have eluvial horizons, but it’s clay that’s been leached out of the eluvial horizons rather than iron or organic acids like in podzols.
I know. Too much information. I’m a turbo nerd about this stuff, and like teaching people about it. Even if you take a small bit away, I’m a happy guy.
Neat, a lot of the mushroom books just say podzol but I believe they also grow in some “sandy soil habitats” as the mycologists say so would that be an example of a spot where it’s not actually podzol as you’re saying?
The books also say we have podzol “everywhere” in the Pacific Northwest from the volcanic activity but I expect that to be a generalization.
Yeah that’s correct.
The PNW has aot of podzols because of the volcanic parent material and because of the rainfall. A lot of it wasn’t glaciated so it’s also had time for those eluvial processes to occur, vs. further north in BC.
