They are not aliens, but mushrooms… with funny names.
Yamabushi-take. Mountain monk mushrooms. The Yamabushi mountain monks are old men, they have long hair and beard… well in the legend.
Under the kimono.
This is a hanabi-take. A firework mushroom.
These are called bunapee. The full name is “white buna-shimeji”, so they shortened it.
They all grow in a farm. They are totally white. Recently new colors have been created for nearly all cultivated mushrooms.
I think the hairy one, yamabushi-take can be seen in the woods, in shaded places, on trees, but the shape is less round :
The “hanabi” is a variation of “champignon noir chinois” (“wood ear” ?) that is sold dried in Asian stores :
kikurage, champignon noir, wood ear
“White wood ear” is commonly added to syrup fruit salads in Taiwan. We find it easily dried, but the fresh ones are original in Japan.
The shimeji can be seen in the wild but it’s brown and larger. It grows on the ground.
Wild mushrooms are rare now in Japan, or there are too many people that went to take them before you arrive. No chance of gathering any.
On the many varieties we can buy, only two have a strong flavor, the shiitake and the matsutake, which is very expensive.