128 Repout of Tiiio Botanist of the 



EXPLANATION OF PLATES FOR ASPARAGUS RUST. 



Plate X, Fig. 1. — ^cidial or ^^ clnster-cujp^^ stage of Pucoiiiia 

 asparagi showing sori made up of clusters of cup-shaped 

 pustules. Magnified 3 diameters. 



Fig. 2. — Cross section of one of the so7'i of Fig. i, shoiving 

 {a) spermogoniuni^ {bh) cccidial cups; one Irokevi, with 

 spores escaping^ also one not broken open. Magnified 25 

 diameters. 



Plate XL Fig. 1. — Uredo, or "red-rust" stage of asparagus 

 rust showing form, of S'jri, or rifts in the hark of the 

 asparagus stein. Magnified 2 diainete7's. 



Fig. 2. — Cross section of cue of the sort shown in Fig. i, 

 (w) uredospores^ {t) ieleuto^'^pores. Magnified 76 diamcttrs. 



Fig. 3. — Uredospores and teleutosporcs. Magnified 75 

 diameters. 



Plate XI L Oeneral view of asparagus field sprayed fall of 

 IS'98, showing sprayed 'belt on the right. Taken Sept. 

 27, 1898. 



Plate XIIL Nearer view of field shoion in Plate XII. 



Plate XIV. View of field sprayed 1899 and 1900., showing 

 alternate rows sprayed. Taken S(pt. 15., 1900. 



Plate XY. Field shomi in Plate XI Vy looking across rows. 



