Centennial Palm-Horticultural Hall Centennial palm-Horticultural Hall 1 silver albumen print; 41 x 33 cm. Mounted on backing board. Titles on labels: Centennial palm - Horticultural Hall, and, Centennial palm, Horti. Hall. Hoffner, Jacob, Cincinnati, Ohio, Exhibit #54, Horticultural Hall, Bldg. #151. The Sago palm, over 100 years old, belonged to Robert Morris in 1776. Arrangement of palm trees and ferns, the center palm, a Sago palm, is the Centennial palm.