124 FUNGOID PESTS OF CULTIVATED PLANTS. 



diseased ones and producing the disease, since which time the experi- 

 ments have been confirmed. 



The organism named Micrococcus amylovorus consists of single cells, 

 of oval or roundish shape (1-1J x ^-| p) and quite colourless. For the 

 most part they remain single, but may often be found in pairs, rarely a 

 series of four or more, but never extending to chains. 



Sacc. Syll. viii. 3887 ; Amer. Nat. xvii. 1883, p. 319 ; Arthur, 

 History and Biology of Pear Blight, 1886, plate ; Grove, Syn. Pact. p. 10. 



MEDLAR CLUSTER-CUPS. 

 JEcidium Mespili (DC.). 



This species of cluster- cups appears now to be recognised as distinct 

 and alone, without Uredo or Puccinia to keep it company. It is only 

 reported to occur on the leaves of Mespilus and Cotoneaster. 



Bounded or irregular spots are formed upon the leaves, which are 

 yellowish or reddish on the upper side, with a yellow border, thickened in 

 the centre. The cups are cylindrical, splitting at the edge into narrow 

 teeth or threads. ^Ecidiospores angular (19-24 /A diam.), very minutely 

 warted and brown. 



There is a suspicion of this species having been found in Britain, but 

 it evidently has never given any trouble as a pest. It occurs also in 

 France and in Germany. 



Sacc. Syll. vii. 2773 ; Plowr. Brit. Ured. p. 232 ; Mass. PL Dis. 257. 



An anthracnose attacks the leaves of the Quince (Gl&osporiutn 

 Cydonice) in Southern Europe, as well as two or three kinds of leaf -spot, 

 and Oidium Cydonia in Italy. 



MEDLAR WHITE MOULD. 

 Oidium mespilinum (Thiim.). 



This white mould occurs on the living leaves of Mespilus in Austria, 

 forming broad white thin patches on the upper surface, which consists at 

 first entirely of an epiphytal web of mycelium. From this shortly arise 

 the fertile branches, which are at first simple and club-shaped. After- 

 wards two or three elliptical cells or conidia are cut off from the upper 

 portion of the branches, and form the short chain of spores (10 x 6 p) 

 which ultimately acquire a pale grey colour. 



It is clear that this is an epiphyte of the same character as the 

 various species of Oidium which precede such mildews as that which 

 attacks the Hop, Rose, Gooseberry, Maple, Garden Pea, and many other 

 plants. 



In the case of any trouble the application of dry powdered sulphur is 

 the safest remedy. 



Sacc. Syll. iv. 208 ; Grevillea, xvi. 58. 



Another white mould (Ovularia necans) has damaged Quince and 

 Medlar trees in Italy and France. Two kinds of leaf-spots are known on 

 Medlar leaves, but neither is recorded as British. Phyllosticta Mespili 

 and Septoria Mespili are both of them European. 



Journ. R.H.S. xxviii. 1904, p. 698. 



