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VOLUME XXIX NUMBER 6 
BOLANICAL.(AZETTE 
JUNE, r900 
BOTRYTIS AND SCLEROTINIA: THEIR RELATION 
TO CERTAIN PLANT DISEASES AND TO EACH 
OTHER. 
RALPH E. SMITH. 
(WITH PLATES XXV-XXVII AND THREE FIGURES ) 
Ix connection with the work of the Hatch Experiment Sta- 
tion of the Massachusetts Agricultural College, a disease of 
hothouse lettuce has been under investigation for several years, 
The practical results of this investigation will appear in a bulletin 
of the station. It is the purpose of the present article to present 
Some results of this study which seem to have a value beyond 
that of their practical relation to the lettuce disease, and to dis- 
Cuss these results, together with some obtained by other inves- 
tigators, with a view to clearing up some unsettled points in the 
life history of certain fungi. 
he question of the relation of certain species of the Poly- 
actis section of the genus Botrytis to certain species of Sclerotinia 
© "9 mew one. The literature of plant diseases, especially in 
Europe, abounds in descriptions and discussions of cases of 
Plant diseases where one or the other or both of these forms 
*ppeared, and considerable difference of opinion has resulted as 
© their real relations to the disease and to each other. In this 
Sontention are involved principally two species of Sclerotinia, 
fe tmely: S. fuckeliana De By. and S. Libertiana Fckl., and one 
_ *Pecies of Botrytis, B. cinerea Pers. (B. vulgaris Fr., and numer- 
ame other Synonyms). Largely on the authority of De Bary, 
369 
