"Shiitake comes from its Japanese name, shiitake (椎茸; literally "shii mushroom", from "shii" the Japanese name of the tree Castanopsis cuspidata that provides the dead logs on which it is typically cultivated).
In Chinese, it is called xiānggū (香菇, literally "fragrant mushroom"). Two Chinese variant names for high grades of shiitake are dōnggū (Chinese: 冬菇, "winter mushroom") and huāgū (花菇, "flower mushroom", which has a flower-like cracking pattern on the mushroom's upper surface); both are produced at lower temperatures.
Other common names by which the mushroom is known in English include "Chinese black mushroom", "black forest mushroom", "black mushroom", "golden oak mushroom", or "oakwood mushroom".
In Korean it is called pyogo (hangul: 표고), in Thai they are called hed hom (เห็ดหอม, "fragrant mushroom"), and in Vietnamese they are called nấm hương ("fragrant mushroom")...
Shiitake are native to Japan, China and Korea and have been grown in all three countries since prehistoric times"...[http://en.wikipedia.org/wiki/Shiitake]