Lingzhi fungus

Lingzhi fungus also called Glossy Ganoderma resembles a mushroom in shape.  It is a herb that is believed to prolong a person's life and is an ancient symbol of longevity. 

As it looks like a ruyi （如意）, it is often used to convey the meaning of 'as one wish' .  For example, please refer to : Persimmon