310 HALF-HOTTR8 IN THE GREEN LANES. 



moist situations, and can be readily recognised DY 

 the small black clots, not bigger than a pin neau, 

 on the under side of the leaves. When examined 

 under the microscope with a quarter of an inch 

 objective, the pustules are seen to consist of aggre- 



Fig. 251. 



Maple Ulight (Unciitula bicorm's). 



Cations of three-celled spores, whence their name of 

 Triphragmium. 



Another species of microscopic fungus is the 

 Maple Blight (Uneinula bicornis, Fig. 251). This 

 may be found, as a kind of whitish powder, on 

 the leaves of the maple and sycamore during the 

 autumnal months. If examined with a pocket-W, 



