Pecan Truffles

Here in north central Texas we are supposed to have pecan truffles (Tuber lyonii) growing in association with (duh) pecan trees. Does anyone have any experience with them? I vaguely recall finding some as a kid, but I just don't spend enough time rolling around under pecan trees in the fall.

Check out http://www.caes.uga.edu/commodities/fruits/pecantruffles/research.html