320 Wormald. — - Further Studies of the ‘ Brown Rot ’ Fungi. I. 
Fig. 8. A twig cut longitudinally to pass through the base of the wilted shoot on the right ; 
there is no definite canker on the twig, but necrosis of the xylem is seen as a dark line on the inner 
side of the cambium line (natural size). 
Fig. 9. Portion of the twig shown in Fig. 8 as seen with a lens (x 4). c., the cambium; 
jz., necrosis of xylem elements shown by an almost continuous line of gum-pockets. 
Fig. to. Section of twig, as seen with a lens ( x 5), at 2 cm. above a Shoot-Wilt canker; necrosis 
of the xylem is seen as an arc of dark spots (‘gum-pockets ’) on the right ; condition in June of the 
same year in which infection occurred. 
Fig. 11. Section across a twig at 2 cm. below a Shoot-Wilt canker, showing the * gum-pockets ’ 
embedded in the xylem ; , condition in Marph of the year following infection. X 5. 
Fig. 12. Section through a canker on a two-year-old twig (about 12 months after infection), 
showing the callus covering the lesion, x 5. 
Fig. 13. Pure culture of Sclerotinia cinerea , obtained by placing a particle of infected tissues 
from a canker on carrot agar, 20 days old, growing at room temperature (slightly reduced). [Com- 
pare culture of S. cinerea derived from an ascospore, as shown in Ann. Bot., vol. xxxv, Plate VI, 
Fig. 4-1 
Fig. 14. Portion of a twig bearing short shoots, one of which has been killed as a result of 
inoculating a single leaf (punctured) with conidia of S. cinerea. 
