I have an improved meyer lemon tree in a pot next to my pool. It's in a greenhouse where I have been growing many different plants in pots. It recently began growing mushrooms on top of the mulch.
As mulch, I have moss (store bought) and pine needles from my yard. Also, I do use some mushroom compost in other pots in the greenhouse.
1) What type of mushroom is this?
2) Will they damage the plant or its fruit if left there?
3) Will the mushrooms help the plant?
4) Are these mushrooms edible?
Any insights would be very appreciated as I am new to growing citrus, studying mushrooms, and growing in greenhouses.