No. S. A large area of disease pustules on a smooth-bai-ked orchard tree. — Photo- 



(jniiih hij Prof, ('olliiis. 



No. 9. Bark removed from over a canker, showins the cracks at the centre and 

 the fan-shaped spi-ead of the yellowish f unions mycelium; also, at the lower edge, 

 the circular margin of the disease. — Photograph hij Prof. VoUins. 



