"Chichitake" is a mushroom which is loved by people in Nasu Shiobara-shi.
As you can see in kanji for chichitake, when you scratch it, the white thing comes out from a shade, and the smell is unique. It used to be picked up easily in a mountain in Nasu Shiobara, but now the number of the mushrooms decreased and they are precious.
It is used for ingredients of soup for soba and udon in Nasu Shiobara because it is delicious.
People there enjoy "Chitake soba" which has chichitake and eggplants.