126 



BOTANY. 



ment with the mycelium. Is there only one at this point of attachment, or 

 are there several? Are there any rhizoids present at the point of attach- 

 ment ? Sketch the different stages. 



213. Description of the mucor fruit. — We shall probably 

 note at once that the stalks or upright threads which support 

 the heads are stouter than the threads of the mycelium. 



These upright threads soon have formed near the end a cross- 





Fig. 99. 

 Portion of banana with a mould (Rhizopus nigricans) growing on one end. 



wall which separates the protoplasm in the end from the 

 remainder. This end cell now enlarges into a vesicle of con- 

 siderable size, the head as it appears, but to which is applied 

 the name of sporangium (sometimes called gonidangium, 

 because it encloses the gonidia). 



At the same time that this end cell is enlarging the cross^wall 

 is arching up into the interior. This forms the columella. All 

 the protoplasm in the sporangium now divides into gonidia. 



