Mycelial and sclerotial de 
of Sclerotinia libertiana and S. minor on various substrata 
A. —Sclerotia of S. libertiana formed within the seed stalk of lettuce 
B. —Luxuriant cottony growth of mycelium of S. libertiana on salsify root held in a moist chambt 
t room temperature 
C. —Growth of S. libertiana on salsify under moderately dry conditions 
D. E.—Mycelial and sclerotial development of S. minor on slices of parsnip and carrot, respectivel 
F, G.—Mycelial and sclerotial development of S. libertiana on slices of parsnip and carrot, respectivel 
H.—Sweet potato attacked by S. libertiana, showing development of large sclerotia 
