In Korea, Dried Shiitake Mushrooms are highly prized because they contain more vitamin D than their fresh counterparts.
Baek-hwa-go are the highest grade of shiitake mushrooms. They are called "white flower mushrooms" in Korean because of the white cracks on the mushroom caps. The cracks intensify the fragrance an flavour of the mushroom and only appear on one in a thousand mushrooms. They develop in cold climate forests when there is low humidity and frost.
Heuk-hwa-gomeaning "black flower mushroom" in Korean, they have dark brown cracks on the mushroom cap. These develop when dew forms on the white cracks of baek-hwa-go and are also very rare.