178 



MORPHOI.OG Y. 



After mounting a small quantity of the mj'celium bearing these 

 heads, if we have been careful to take it where the heads appear 

 quite young, it ma)' be possil)le to study the early stages of their 



Fig. Too 

 Portion ot Ijaiiana with a mould (Rliizoptis tiigricatis) growing on one end, 



development. A\'e shall probaMy note at once that the stalks or 

 upright tlircatls which support the heads are stouter than the 

 threads of the mycelimii. 



These upright threads soon ha\"e formed near the end a cross 

 wall which separates the protoplasm in the end from the remain- 

 der. This end cell now enlarges into a Nesit Ic cf considerable 

 size, the hepd as it appears, but to which is applietl the utune of 

 spiiraiigjiuti (sometimes called gonidangium), because it encloses 

 the jL^'iitiidh'i. 



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

 is arching up intu (he interior. This forms tlie rohnticlla. AH 

 the protiiphisin in the s|iorangium now tli\ides into gonitlia. 

 These are small rotuidetl or i)\al liotfics. The wall oi the spo- 



