128 Report OF THE BoOTANIST OF THE 
EXPLANATION OF PLATES FOR ASPARAGUS RUST. 
Pratt X. Fie. 1.— Weidial or “cluster-cup” stage of Puecinia 
asparagi showing sort made up of clusters of cup-shaped 
pustules. Magnified 3 diameters. 
Fia. 2.—Cross section of one of the sori of Fig. 1, showing 
(a) spermogonium, (bb) awcidial cups; one broken, with 
spores escaping, also one not broken open. Magnified 25 
diameters. 
Pratt XI. Fie. 1.— Uredo, or “red-rust,” stage of asparagus 
rust showing form of sori, or rifts nr the bark of the 
asparagus stem. Magnified 2 diameters. 
Fie. 2.—Cross section of one of the sori shown in Fig. 1, 
(uw) wredospores, (t) teleutospores. Magnified 75 diameters.’ 
Fie. 8.— Uredospores and teleutospores. Magnified 75 
diameters. 
Prare XII. General view of asparagus field sprayed fall of 
1898, showing sprayed belt on the right. Taken Sept. 
27, 1898. 
Prats XIII. Nearer view of field shown in Plate XII. 
Puare XIV. View of field, sprayed 1899 and 1900, showing 
alternate rows sprayed. Taken Sept. 15, 1900. ) 
Prate XV. Field shown im Plate XLV, looking across rows. 
