Makers who use mycelium will grow these roots in addition to a grain substrate, largely rice or oats. The moment mycelium roots grow, the roots and substrate turn out to be intertwined and so are unachievable to separate. The 2nd kind is mycelium, and you'll want to normally avoid it. https://holdenjouja.tribunablog.com/facts-about-edible-mushrooms-nz-revealed-40650435