How about fungi/fungal balls?
Wow, you guys are fast!
3 vote for fungus. They look like the Fibularhizoctonia sclerotia reported by Matsuura et al. 2000.
I believe the official term is "Termite Balls"
I've seen those! See my photo here:
Okay, I missed the fungus answer. Hey, it's early in the morning here. :-)
Tell me now!