In this beautiful depiction of Saint Joseph of Arimathea he is seen wearing the garments of a prominent councilman (Mark 15:43) and holding the mixure of "myrrh and aloes" (John 19:39), as well as the linen with which he wrapped the Body of our Lord Jesus (John 19:40) which was the custom of the Jews.
He is also holding his staff which, as tradition tell us, he had cut from a thorn tree before leaving his Palestinian homeland. As he approached Glastonbury, England upon his missionary journey, he became weary. He stuck the wooden staff into the ground to lean on it. Later, the staff took root and began to grow leaves. It was transferred to the grounds of the first church, where it amazed everyone by flowering in the middle of winter.
More can be read about St. Joseph here.