1888. | * BOTANICAL GAZETTE, 55 
andrinia, upon which the same mildew was found in abun- 
dance. This low Calandrinia, probably C. Menziesii, grows 
in open dusty stubble-fields. It must, however, be remem- 
years ago as to almost destroy the host in whole patches. 
This year it was obtained only after long search in the moist- 
€st place in which the vetch will grow. : 
as cronospora Euphorbie Fcl. is a species which quickly 
diminishes in times of drought. It is not uncommon on Eu- 
Phorbia maculata in a wet season, but has been rare, indeed, 
for the Past two years. A new host, E. serpyllifolia, was 
added last year by Mr. Hitchcock, who found it at Jewell 
Junction, é ( 
Peronospora leptosperma DBy. was easily collected in 
1885, on both Artemisia biennis and A. Ludoviciana. ur- 
