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I love using stump dirt as potting soil, and last year I concluded that this miraculous substance was probably mushroom compost.  Now I'm going to guess again --- maybe beetle castings?

Three weeks after Mark cut down a very decayed stump, I started piling the debris in my wheelbarrow to move to a new hugelkultur mound.  Imagine my surprise to find the rotting wood literally wiggling with life!

The most obvious living things in the stump were these impressive beetles.  At least half a dozen were present, which is typical of the Horned Passalus (Odontotaenius disjunctus) since the species is subsocial, with several adults sharing the duties of childcare.

The Horned Passalus eats "decaying wood and/or fungi" (according to Bugguide.net), and I realized that the round pellets that make up stump dirt do look a lot like castings (aka poop).  I wonder if beetle castings have the same near-mythical properties as worm castings?

Of course, it's not really fair to assume the beetles are entirely responsible for creating stump dirt.  The log was also home to wolf spiders, slugs, sow bugs, wood cockroaches (hiding in galleries in the less decomposed wood), tiny snails, and much smaller inhabitants that I could barely make out with the naked eye.  So the jury's still out on who or what produces stump dirt.