406 P BOTANICAL GAZETTE - [JuNE 
been obtained from sclerotia developed from Botrytis. On the 
basis of internal structure these sclerotia cannot be clearly dis- 
tinguished from the others. They vary in compactness and 
seem to have no very characteristic makeup. The two species 
often occur together, as Botrytis does in connection with many 
other fungi, and it is believed that the only unprejudiced argu- 
ment which has ever existed in favor of the connection between 
Sclerotinia Libertiana and Botrytis cinerea is their frequent simul- 
taneous occurrence, in connection with the similarity of the 
mycelium and the fact that they often attack plants in a very 
similar manner; all of which is explained by their close relation- 
ship. When carried further than this they may be readily sepa- 
rated and distinguished from one another and the distinctive 
characters brought out which have been described. 
Mass. AGRIC, COLLEGE, 
Amherst, Mass. 
EXPLANATION OF PLATES XXV-XXVII. 
PLATE XXV., 
Fic. 1. Typical conidiophore of Botrytis cinerea Pers. 
Fic. 2. Portion of same, more enlarged. 
Fic. 3. Conidiophore from old, exhausted culture. 
Fic. 4. Botrytis slightly enlarged. 
Figs. 5-9. Botrytis from onion. 
Figs. 10-11. Conidia of Botrytis cinerea. 
FIG. 12. Conidia of Botrytis from onion. 
Figs. 13-17. Development of conidiophore of Botrytis cinerea from 
mycelium within a plant. 
1G. 18. Development of terminal branches. ~ 
FIGS. 19-22. Forms of organs of attachment. 
PLATE XXVI, 
Figs. 23-25. Forms of organs of attachment. 
Fig. 26. Tip of a branch of an organ of attachment growing against eset 
Fig. 27. Mycelium of Botrytis from stem of lettuce seedling, causing 
“damping off,” 
Fig. 28. Cross connections in Botrytis mycelium. 
FIG. 29. Filaments of Sclerotinia Libertiana Fckl., entering lettuce leaf. 
