12 



BOTANY 



PART I 



AND BASE. The base serves as a point of attachment, while growth 

 is localised at the apex. In this way a growing point is developed 

 at the apex. As an example of such a form, a young 

 plant of the green Alga, Ulva Laduca (Fig. 5), may be 

 taken. The development of a more complicated external 

 form is represented by the branched, filamentous, or 

 band-shaped Algae, in which the origin of new formations 

 is more and more restricted to the apex. An acro- 

 PETAL order of development, in which the youngest 



Pig. 5. — Viva Lactiua, 

 young stage, show- 

 ing apex and base. 

 (X220.) 



Fig. 6. — Portion of Cladophora glomerata. 

 (X48.) 



Fig. 7.—Cladostephus vcrticiUatvs. (After 

 Pringsheim, x30.) 



lateral members are always nearest the growing apex, is clearly 

 demonstrated by the branched filaments of the common green Alga, 

 Cladophora glomerata (Fig. 6). Still more pronounced is the apical 



