Home grown shiitaki mushrooms from Far West Fungi are fun to grow, photogenic, and tasty. These double their size every day. You can see how the block of sawdust and rice hull are supporting the mycillium (mushroom roots) and cover the block with white. Exposure to indirect sunlight forms dark spots that grow into the mushrooms. Many dark runts are showing, some are balls white with brown skin, and others in in the process of opening. https://farwestfungi.com/
https://www.healthline.com/nutrition/shiitake-mushrooms#nutrients