BY D. McALPEST. 485 



And of the special reproductive bodies, the glomeruli originate 

 from the colourless hvphae, appearing in abundance when no other 

 is present. Even when the brown filaments are formed, the 

 glomeruli are seen to be surrounded and not produced by them, 

 as they leave a perfect cavity among the filaments, with the clear 

 colourless layer at its base. 



The remaining reproductive bodies are formed from the 

 coloured hyph«, and apparently appear in the following order 

 when not developed simultaneously : — spermogonia, antennaria, 

 cerato-pycnidia, pycnidia and perithecia. 



This specimen served a very useful purpose in determining the 

 origin of the coloured from the coloxirless hyphs. At first 

 nothing was observed but colourless hyphie and numerous 

 glomeruli, and from the constancy of this appearance I was 

 inclined to the opinion that the colourless hyphe with their 

 reproductive bodies formed an independent fungus, afterwards 

 overlaid by another fungus. But on further search, I found 

 coloured hyph* arising from the continuation of the colourless 

 hyphae, and thus the connection was established (figs. -tO-tl). 



General development of sporidia. — Taking an ascus in the young 

 condition and when only about half the size of the adult form, it 

 is found to be filled with finely granular protoplasm, only the 

 short stalk being without it, and there is a minute, slightly oval 

 primary nucleus in the centre (fig. 21). 



When further grown the protoplasm recedes from the top, 

 enveloped in its own membrane, and gradually gets further and 

 further away, until in the mature form it may be 9 /i from the 

 top of the ascus. It divides meanwhile into the sporidia, which 

 soon acquire a distinct ontUne and a few septa. There is usually 

 a slightly knobbed pedicel projecting from the top of the topmost 

 sporidium when immature, apparently indicating a contracted 

 portion of the protoplasmic membrane (fig. 12). 



The contents of the at first colourless sporidia soon change 

 into a pale green, increase in size and develop more septa (fig. 10). 



This colour nest changes to greenish-brown and finaUy a decided 

 dark-brown like the mycelium, which is the mature form (fig. 12). 



