An original character by oso (toolate) that is a personification of the 'Psilocybe argentipes' species of mushroom, also known as the hikageshibiretake.
Her name is listed on oso's website and in his artbook as "Psilocybe Argenti" (ã‚·ãƒã‚·ãƒ™ãƒ»ã‚¢ãƒ«ã‚²ãƒ³ãƒ†ã‚£.)