1904] SMITH—PUCCINIA ASPARAGI 31 
vigorous and ready for development, as may be proved by placing such 
a stalk ina moist chamber, when the “cluster-cups” break out in great 
luxuriance. This is another direct water-relation of the rust, there- 
fore, being apparently a provision for developing aecidiospores only 
when conditions are favorable for germination. In the dry, windy 
districts such aecidial spots remain in this condition far into the 
Fic. 9.—Uredo infection on green, vigorous stalks, checked and changed to 
teleuto by lack of atmospheric moisture. Bouldin Island, July 28, 1903. 
summer, Finally, they pass into the state shown in fig. 8, the original 
aecidial areas drying out, leaving a feeble development of mixed 
uredospores and teleutospores about the edges. 
Through the period of midsummer, from June to September, 
but little trace of rust can be found in most of this country. Care- 
ful search, however, reveals here and there on volunteer growth in 
sheltered nooks the condition shown in jig. 9. These are green 
