Bushu Ito school tsuba, clouds in positive silhouette, shaped in imitation of reishi, the fungus of immortality, a mushroom
of irregular shape and sometimes considerable size found growing in the wild, usually at the roots of old trees.  Early
Taoists believed that its consumption conferred long life.
There is a small temple carving in the form of an Ura-Manji
on the seppa-dai.  The Ura-Manji in Japanese Buddhism signifies intellect and strength, characteristics a samurai would
need in the discharge of his duties.  Edo period.

 

cf.

 Akimoto, Tsuba Ku Bushu Itu Ha, p. 59.