2 4 o PRACTICAL BOTANY 



needles, then moisten it with alcohol, and mount in water. 

 Examine it under a high power, and observe the branched, 

 septate mycelium, which frequently forms a very dense mat : 

 this is especially the case if it be grown on Pasteur's solution 

 with sugar. Note that certain branches, which grew up from 

 the substratum, end in a brush of closely arranged parallel 

 branches, and that each branch is terminated by a string of 

 conidia : these are formed by basipetal abstriction, in the same 

 way as in Aspergillus. 



The conidia may be germinated in the same way as those of 

 Aspergillus, and with suitable precautions pure cultures may be 

 grown on various nutritive substrata. 



