99 



of the chromosoEies, or, to speak ijiore accurately , of the 

 cliroinatin, occurs alv/ays in tlie last spore -form preceding 

 the I'roduction of ci.ecidia, in tlie teleutosjore -when pres- 

 ent. The diploid condition, extending from the aecidium 

 to the teleutospore, is lengtiiened hi' the intercalation of 

 new phases, v/hich, in some cases, seem to have tlie pov/er of 

 contini^ing the diploid genera.tion indefinitely. The haploid 

 generation, from the teleutospore to the hinucleate cells 

 at the "base of the a.ecidiiijn, is never lengthened hy the in- 

 tercalation of new phases. In other v/ords, in the Ure- 

 dineae the diploid generation hits 'become prolonged tlirough- 

 out tlie greater portion of the life history. 



In the red a,lgae, it seems likely that a simila.r post- 

 ponement of reduction has taJcen place. In the llemalionales^ 

 v/hicli is considered the most primitive group of the Rhodo- 

 phyceae, the point of reduction is retaoved from the point 

 of nuclear fusion only "by the few cell-generatioas in the 

 cystocajfp (Y/OLFE on T Jemaliori , '04). In the higher forms, 

 such as the Rhodomelaceae ' YAI'.IAITOUCHI on Folysiplionia , 

 •06), and the Ceramiaceae ( Griff itlisia) , nuclear reduction 

 is sepsj'ated from nuclear fusion, not only by tlie cell- 

 generations of the cystocarp, hut e-1so by all the divisions 

 of the vegetative cells of the tetrasporic plant. Tliat is, 



