NOTES AND LITERATURE 



PLANT PHYLOGENY 

 The Origin of the Archegoniates.— There is in the theoretical 

 discussion of plant evolution perhaps no gap which is more 

 difficult to bridge than that between the thallophytes and the 

 archegoniates, or more precisely that between the higher alga- 

 and the liverworts, mosses and ferns. The most recent discussion 

 of this problem is by Schenck, 1 one of the authors of the "Lehr- 



arose from the IMi.-mphyce.-e or brown alga-. 



A number of earlier writers have endeavored to n-lale the 

 archegoniates to the Chlorophycea- or green alg;e. This has 

 generally been attempted through Coleocha?te or Chara. Coleo- 

 chaete has been a favorite type for the reason that its fruit, de- 

 rived from the germination of the egg, is a globular multicellular 



