EXPLANATION OF ILLUSTRATIONS 
Plate 1, Fig. 1—(a) Hypha of Sclerotinia libertiana and (b) of S. trifoliorum from 
the margin of colonies on potato agar showing relative size of the two species. 
Plate 1, Fig. 2—Microconidia (a) of Sclerotinia libertiana and (b) of S. trifoliorum 
borne on hyphal branches in old cultures. 
Plate 1, Fig. 3—Asci and ascospores (a) of Sclerotinia trifoliorum and (b) of S. liber¬ 
tiana, drawn with the same magnification. 
Plate 1, Fig. 4—Apothecia of S. trifoliorum developed from sclerotia. 
Plate 2, Fig. 1 —Normal plant of crimson clover of the same age as the diseased ones 
shown in Plate 3. 
Plate 2, Fig. 2—Sclerotia (a) of Sclerotinia trifoliorum and (b) of S. libertiana, 
natural size. 
Plate 2, Fig. 3—Crimson clover seed contaminated with small sclerotia, which can 
scarcely be distinguished from the seed. 
Plate 3, Fig. 1—Plants of crimson clover affected with stem rot, S. triofoliorum, show¬ 
ing several stages of the disease. Sclerotia have formed on the stems as indicated by 
the direction of the arrows. 
Plate 3, Fig. 2—Apothecia of S. trifoliorum developed from sclerotia grown in pure 
culture and buried in sand. 
