FUNGOID PESTS OF CULTIVATED PLANTS. 179 



Olcandri which is parasitic on the twigs, and not upon the leaves, in 

 Algeria. The latter is apparently the Septoria Olcandri of Montagne. 



Akbutus Leaf-spot. 

 Phyllosticta Arbuti (Desm.), PI. XVI. fig. 2. 



The parasites of the Strawberry tree are, for the most part, confined 

 to the ordinary leaf-spots of small importance, and of these the most 

 common is the above-named, which forms small dingy spots scattered over 

 the leaves. 



The receptacles are very small and sprinkled like little dots over the 

 upper surface of the spots, sometimes densely clustered together. The 

 sporules are also very minute, ovoid, and colourless (5 x 3 p), often exhibit- 

 ing two small nuclei. The attacked leaves are in most instances at first 

 fading. 



This has been recognised in France and in Britain. 



To pick off and burn infected leaves is to help preventing the spread of 

 the parasite. 



Sacc. Syll. iii. 118 ; Grevillea, xiii. 72. 



Another species has been detected in Portugal and Algiers (Phyllosticta 

 microsticta Dur.) with small spots which soon become white, with a 

 distinct dark brown margin. The sporules are even smaller than in the 

 above. 



Akbutus Purple Spot. 

 Septoria Uncdonis (Rob.), PI. XVI. fig. 3. 



This is apparently the most common of the Arbutus parasites, and 

 causes small whitish spots upon the leaves, which are circumscribed by a 

 broad purple margin. The receptacles are scattered over the upper 

 surface of the spots, and the sporules are elongated and thread-like 

 (25 x H p), but without indication of septation. 



It is recorded for France, Portugal, Italy, and Austria, as well as in 

 Britain. 



Sacc. Syll. iii. 2061, x. G282 ; Cooke, Hdbk. No. 1322. 



A form of leaf-spot has been found in Italy, supposed to be a variety 

 of the above, although that seems to be doubtful, since the sporules are 

 twice as long and distinctly septate (50-80 /z long). 



Another leaf-spot (Septoria Arbuti) has been found in Italy, which 

 much more resembles the above type than the assumed variety, since the 

 sporules are almost the same. 



Akbutus Tuft Mould. 

 Cercospora Molleriana (Wint). 



The only mould which is recorded as attacking the foliage of the Straw- 

 berry tree has occurred in Portugal, but its appearance in any other put 

 of Europe is open to doubt. The spots are normally circular, but often 

 marginal, and pallid grey, with a distinct margin. The mould appears in 



n 2 



