f>2 PARKHS : FUNGI PARASITIC 



;h>' Cephalosporium of Lecaniun viride readily infect Leca 

 nium nigrum, and via versa; or are these Cephalosporin 

 physiologically distinct, though morphologically identical ? 

 Some such distinction has been shown for species of Enipusa 

 on flies.* 



IV.— SUMMARY. 



J. Fungi growing upon scale-insects appear to be "widely 

 apread. They are especially common in the tropics, bnt 

 so in temperate regions. A great number have been 

 found in Ceylon. 



2. They often attack the insects in epidemic fashion 

 This has been chiefly observed in the case of Aschersonia. 

 Cephal isporium, and Microcera. 



;'». There seems no doubt of the parasitism of most of 

 the forms, or at least that they are the direct cause of 

 the insect's death. The parasitism ia perhaps not of a 

 very Bpeci ilizedkind. Some have been observed in America 

 to check and even to eradicate such destructive pests as the 

 San Jos6 Scab- (Aspidiotus perniciosus) and the mealy wing 

 (Aleurodes citri.) 



1. The commonest genera are Nectria, Aschersonia, 

 Oephalosporium, and Microcera ; at least, as Ear as Oeylon is 

 concerned. 



ation is called to I he probability that certain fungi 

 >ribed in the past as growing upon the surface of leaves 

 were really parasitic od scales. This is very Likely the case 

 for Aschersonia. 



6. Tie- ascus-forms nearly all belong to the Pyrenomy- 

 -Hypocr< lies, a group containing the well known ento- 



mogenous genus Cordyoeps. Representatives of eight or 

 nine genera have bo Ear been found on coccids. Thus the 

 entomogenous habit seems a common feature of the Hypo- 



7. The remaining two \ oomycetes, bfyriangium 

 and A.piosporium, are of less importance. The former is 



'• • rncn he c\t.. pp. \~ and 50. 



