This Grzyb icon is made in Material Design style developed by Google. This style is based on extremely simplified shapes, thin two-pixel lines, and is optimized for 24x24 px. Unlike other vector icon packs that have merely hundreds of icons, this icon pack contains 4,300 icons, all in the same style and quality.
The mushroom is round on top and rectangle on bottom shaped like a tree. It goes on to show that this mushroom is used on pizzas in the united states and all over the world. It tastes good and could be a good topping but it may not be if its rotten.