Has been collected several times from CA, Debbie. Outer warted peridium is unique in the hypogeous world in my experience, in that the sporocarp will “heal” being munched on by critters. Odd to find a hole in a piece of charcoal that has warts on the inside of the hole. Unless you know what caused the hole.
Have grown it several times. But tried growing it at Bishop’s Jones Creek Tree Farm without success. To my knowledge it has never fruited there.
There are important soil considerations when growing L. carthusianum. When mature and fresh, it is my favorite truffle. Elements of dried morels, butter, pineapple and pear can be smelled. If over-mature, can get rank though. Sporocarp needs to be firm to be edible.