BY D. McALPINE. 471 



As already stated I liave examined specimens from the tlii-ee 

 colonies of Victoria, New South Wales, and South Australia 

 during the months of July and August. In Victoria I selected 

 specimens from an orange tree in my own garden at Armadale; 

 from another garden at Kew, a suburb of Melbourne; from the 

 Royal Horticultural Gardens, Burnley; from a few other gardens; 

 and from lemon trees grown on a large scale at Doncaster. The 

 results obtained have been compared with those of South Aus- 

 ti'alian and New South Wales specimens, and there is no doubt 

 but the same fungus is common to all. The chief results will 

 now be given from each district separately', to see how far similar 

 forms are associated together in widely separated districts. 



There is not only variety in the number of forms met with, 

 starting with the gonidial and ending with the perithecial stage, 

 but also in the different organs, and I have endeavoured to give 

 some idea of this by representing variations in the characters of 

 the self-same organs. 



Victorian Specimens. 



Doncaster specimens. — Doncaster is situated about 10 miles 

 from Melbourne, where there is a well-known orchard with 23 

 acres mostly under lemon-trees, and in some situations and on 

 certain trees there was abundance of the " Sooty Mould." The 

 variegated lemon supplied the material, and as there was a 

 greater variety of reproductiv.e bodies met with than in any of 

 the other specimens, it will be convenient to begin with it and 

 give a general description of the fungus. It occurs on the living 

 leaves particularly on the upper surface, but it may also 

 appear more or less on the under surface. It is also on the 

 branches as well as on the fruit, usually the upper or stem end 

 as the fruits hang down. It forms black soot-like incrustations, 

 often covering the entire upper surface of the leaf and peeling off 

 in flakes. It is entirely superficial, not penetrating the tissues 

 in any way, and therefore does not act as a parasite. There are 

 all sorts of gradations in the nature and extent of the fungus. 

 It may appear at first just like a sprinkling of dust on the leaf 



