486 THE SOOTY MOULD OF CITRUS TREES, 



Alongside of each other in the same perithecium the three 

 different coloured stages may be seen, but the sporidia in any- 

 individual ascus are all of the same colour. 



When treated with potassium-iodide-iodine, the contents of 

 the coloui'less sporidia immediately assumed a beautiful bright 

 canary-yellow tint, but the rest of the ascus remained perfectly 

 hyaline, showing that the epiplasm or glycogen-mass is not present 

 as in Discomycetes, which gives a reddish- or violet-brown reaction. 

 The green and the brown coloured sporidia were unaffected by 

 this reagent. The contents of the paraphyses were also coloured 

 bright canary-yellow, suggestive of their being simply sterile asci. 

 The number of spoi'idia in each ascus is typically 8, but 4, 5 and 

 6 were also met with. 



Characteristic Distinctions of the Special Reproductive 



Bodies. 



1. Glomendi. — They are generally of a dirty gTeen colour, but 

 ma}^ be pallid or greyish, or even brownish, apparently by coatings 

 of dust, &c., and are more or less spherical or hemispherical in 

 shape. They always originate from the colourless or pale green 

 hyphag, and are the first-formed of the special reproductive bodies. 

 The covering is composed of clusters of mulberry-like green cells, 

 and some of the hyaline cells in the interior are connected with 

 each other by narrow joints. They vary considerably in size, 

 reaching nearly ^ mm. in diameter, and their shape, colour, wall 

 and contents readily distinguish them from others. 



2. Spennogonia. — The spermogonia resemble somewhat the 

 antennaria in appearance, but differ in contents, while they 

 resemble the cerato-pycnidia in contents, but differ in appearance. 

 They vary considerably in shape and size, and it is difficult to 

 distinguish them from the smaller forms of cerato-pycnidia, but 

 the latter are usually elongated and slender, and have elongated 

 regular cells composing wall, while the former have a net-like 

 surface. 



The spermatia so closely resemble ceratopycnospores that they 

 cannot be distinguished from each other. 



