53 



of tlie protuberances mentioned as being foi^med on the free 



surface of t}ie placentail cell cr on the I'pper part of t}ie 



placenta, small curved segments are cut off from the outer 



t he- 

 surfaces of the protuberance in miicli . same way as a segment 



is cut off from the apical vegetative cell, v/ith this dif- 

 ference, however, t}iat tlie cells of the sporogenous lobe 

 are usie-lly uninucleate. In t}iis way a compact tissue is 

 formed, the cells of which round themselves off, each cell 

 producing a carpospore. As the cells round off, the spor- 

 ogenous lobe becomes converted into branched chains of oval 

 cells. The links of a cha.in are free at the sides, but 

 connected with eexh other above and below by a narrov/ 

 strand of cytopla.sm; midway bet\;een connected spores occur 

 callus-like plugs similar to tliose Ijang in tlie pits be- 

 tween adjacent vegetative cells. From the time when they 

 first round off, the spores increase greatly in size, v.nti -3: 

 imuil^ y^^ hey ore rocidy to bO ' Shc^ -, -4J%e- -s por e s ^noac^ro - about 

 in diam e ter , the niioloi moaouring ,V/lien the spores are 

 ready to be shed, their disjneter is about 30-35 Aa^ , tlieir 

 length 40-54 M/ , the diameter of the nuclei 8.5-9 M^. 



This is the usual history of a sporogenous lobe. In 

 some cases a difference is presented because of tlie fact 

 tliat the spore mother cells are rounded off at a ver"" early 



