Oct. If.il.] 



TAKAMINE':—LrFE HISTORY OF IS >ETKS 



187 



Text-fig. 4. Arcliegoniura of Z ./opoH- Text-fig. o. Abnormal. arcliegonium 



ic-, with two egg cells (DDxComps. 8). of I. japonica. Two egg cells arranged 



side by side, without a ventral canal 

 cell (DDxComps. 8). 



ceptional, I have observed that macrospores and microspores deve- 

 loped in one and the same sporangium. 



Fertilization may take place in several of the archegonia and 

 the embryos may be produced , but usually only one of them germi- 

 nates, while the others 

 degenerate (Text-fig. 6. 



V- 



After the spermat- 

 ozoa entered the arche- 

 gonium, it takes about 

 a day or two until an 

 eight to ten celled em- 

 bryo is formed. A 

 small green leaves push 

 out of the macrospore 

 wall after four or five 

 days. 



I. japonica, fertil- 

 ized in Jan. 1916, de- 

 veloped into five to six 

 inches stage of green 

 leaved sporelings in 



Text-fig. G. Female prothalliiim with an 

 embrvo (P>x2). 



