Actually did some research. It's called "Adventitious Roots". It can be common when using Rooting Hormone. Also is possible from seed but rarer (this case is from seed).
That would be awesome. The truffle could be worth more than the plant. I'm perplexed on what it is. The plant is almost ready to flush, the plant looks extremely healthy and nice girth. I been doing this a few years now, this is new to me.
I have never seen anything like this before. I was loosening the dirt on a plant and found this walnut-sized growth on the stem under the dirt. It's really hard. I was jabbing it with a chopstick. Any insight?