THE MORPHOLOGICAL COMPOSITION OP PLANTS. 29 



coherent, have undergone changes of form which obscure 

 their individualities more than before. Not only are they 



much elongated, but they are so compressed as to be pris- 

 matic rather than cylindrical. This structure, besides dis- 

 playing integration of the morphological units carried on in 

 two directions instead of one; and besides displaying this 

 higher integration in the greater merging of the individuali- 

 ties of the morphological units in the general individuality; 

 also displays it in the more pronounced subordination of the 

 branches and branchlets to the main stem. This differentia- 

 tion and consolidation of the stem, brings all the secondary 

 growths into more marked dependence; and so renders the 

 individuality of the aggregate more decided. 



We might not inappropriately call this type of structure 

 pseud-axial. It simulates that of the higher plants in cer- 

 tain superficial characters. We see in it a primary axis along 

 which development may continue indefinitely, and from 

 which there bud out, laterally, secondary axes of like nature, 

 bearing like tertiary axes; and this is a mode of growth 

 with which PhaBnogams make us familiar. 



185. Some of the larger Algce supply examples of an 

 integration still more advanced; not simply inasmuch as 

 they unite much greater numbers of morphological units 



