In China, Reishi is called the 'mushroom of immortality' and 'herb of spiritual power'. Reishi is said to have a positive effect... In China, Reishi is called the 'mushroom of immortality' and 'herb of spiritual power'. Reishi is said to have a positive effect on memory and prevent forgetfulness in the elderly. In addition, reishi may support the immune system. In practice, this fungus is loved by many for its alleged ...