67 
7. That at each angle is a scar where a conidium had been 
borne. How many scars does each conidiophore have? 
‘ 8. The sclerotia-like mass of cells from which the conidiophores 
arise; color, size. : 
Place a lesion, lower surface wp, under the binocular microscope and 
OBSERVE :— 
9. The points emphasized in 5 and 6. 
10. The relation of the tufts of conidiophores to the host- 
tissue, especially to the stomata. 
11. The attachment of the conidium to the conidiophore. Is 
the thickened or the thin end attached to the stalk? 
P Make a pRawinec showing the points brought out under paragraphs 
to 8. 
Saprogenesis. No perfect stage of this fungus has yet been found. 
The fungus continues to fruit for a time after the leaf-tissues die. The 
sclerotia-like bodies from which the conidiophores arise remain alive under 
favorable conditions, in the host-debris. They produce a new crop of 
conidia the next spring which gives rise to the primary infections. 
‘Secondary Cycles are started repeatedly during the summer by 
conidia from primary and secondary lesions. They repeat in detail the 
phenomena of the primary cycle. 
REPORT 
Review and abstract one of the following papers by V. W. Pool and 
M. B. McKay. 
Climatic conditions as related to Cercospora beticola. Jour. 
Agr. Research 6:21-60. 1916. 
Relation of stomatal movement to infection by Cercospora 
beticola. Jour. Agr. Research 5:1011-1038. 1916. 
