494 THE SOOTY MOULD OF CITRUS TREES, 



The colourless hyphfe produce gonidia, gemmi« and glomerules; 

 and the coloured hyphpe produce gonidia, gemmte and the special 

 reproductive bodies known as spermogonia, pycnidia and peri- 

 thecia. 



Detached portions of the hyphfe in both are able to reproduce 

 the fungus, but that need not be specially considered here. 



The starting point is with the colourless hyphfe producing 

 gonidia, gemmae and glomerules; and the final stage is with the 

 coloui^ed hyphfe producing perithecia. The various reproductive 

 bodies of both the colourless and the coloured hyplue were found 

 respectively in close contiguity, leaving no doubt as to their 

 genetic connection, and the real point at issue is, do the coloured 

 hyphfe grow out of the colourless, or is it simply a case of associa- 

 tion 1 Fortunately, in the specimens from New South Wales, the 

 hyph?e were nearly all colourless or pale green, and it was only 

 very occasionally that a brownish filament was seen. However, 

 in some instances, the pale green or colourless fundamental hyphse 

 with projecting colourless filaments was observed to gradually 

 pass into a pale brown shade, and from these cells the brownish 

 and comparatively thick-walled hyphfe arose. So that the colour- 

 less hyphfe may pass into the coloured, and since the various 

 reproductive bodies may arise from the same or adjoining hyphae 

 there is genetic connection and not merely association throughout 

 the different stages of this fungus. The forms assumed by the 

 different reproductive bodies are very varied and almost defy 

 general description, so that I have drawn a number of the 

 different shapes in order to give some idea of the wonderful 

 wealth of variety occurring among them. Besides I have only 

 specially examined this fungus during the winter months, and it 

 I'emains to be seen what are the prevailing forms at other seasons 

 of the year. I hope to examine it monthly, as it occurs with us 

 all the year round, but at present at least seven stages or repro- 

 ductive phases in the development-cycle of this fungus are 

 known — (1) G-onidial and gemmal stage; (2) Glomeruli stage 

 {Heterohotrys); (3) Spermogonial stage; (4) Antennularia stage; 



