H. WORMALD 



175 



similarly affected were sent in from Faversliam; on some of these shoots 

 as many as four leaves were infected and, in a few cases, the discolora- 

 tion had extended from the laminae along the petioles and into the axes 

 of the shoots. During May further specimens showing the same dis- 

 ease were obtained from Maidstone, Margate, and Weston-super-Mare 

 (Somerset) 1 . The diseased trees at Faversham and Maidstone (one large 

 tree in each case) were examined by the writer early in May; by this 

 time conidial fructifications were to be seen on some of the diseased 



Fig. l. 



Fig. 1. Conidia and disjunctors ( x 500). 



Fig. 2. Conidia germinating in distilled water ( x 500). 



leaves in the open. These fructifications were again confined to the 

 upper surface of the leaves and were sometimes in the form of small, 

 scattered, grey tufts, but usually these soon became confluent to form 

 continuous patches or strips which generally followed the lines of the 

 midrib and chief veins (Plate XI, fig. 2). 



The conidia were approximately isodiametric ; the longitudinal axis 

 was generally a little longer than the transverse because of the polar 

 papillae, which were from 0-5 to 2 ^ in length, usually about 1 /x. Conidia 



Mr W. F. Emptage kindly supplied me with specimens from Weston-super-Mare. 



12—2 



