THE AMERICAN NATURALIST [Vol. XLIII 



■own alu;e is but superficial and does not extend 



■I anatomical features. Indeed, both the brown 

 bryophytes present so remarkable a variety of 

 cture that it is very difficult to pick out types 



- held to be representative of the two groups, 

 frequently to the conditions in the Dictyotales, 

 lage is very far from being representative of the 

 a whole and stands rather as a group of very 



tionships. The simpler gametophytes of the 

 nay more readily be compared to the thalli of 

 ower brown algae, but they are very different 

 r forms where the sexual conditions are those of 



"id, moreover, this simplicity in some types of 

 s rather evidence of that general principle of 

 according to which the gametophytes become 

 icture as the sporophytes attain higher levels of 

 t is of course much more difficult to make com- 

 m the sporophytes of the achegoniates and the 



of Schenck's paper appears to the reviewer to 

 > support to his speculation and herein lies its 

 ness, for if 1 the vegetative morphology of the 

 ot suuvestive of relationships to the archegoniates 



the sori of plurilocular sporangia which are pro- 

 y on the surface of certain brown alga?. Accord- 

 the globular male organ of the Charales is really 



