What kind of health benefits do mushrooms have?

As of late, I have been eating quite a lot of mushrooms. Mainly, I eat Portobello mushrooms yum and tonight I am trying Shiitake mushrooms for the first time also yum.

So, considering my excessive consumption of this delicious fungus, I’m just wondering what some of the more notable and less notable, if you think they’re relevant health benefits of mushrooms are.