246 



FOUNDATIONS OF BOTANY 



continuity of the cell-cavity and (in young plants growing on soil) 

 search for root-like portions, in those growing in water for branch- 

 ing portions, and fruiting organs in the form of swellings or short 

 lateral branches. 



With a power of about thirty to sixty diameters sketch a selected 

 plant of moderate extent as. nearly complete as possible or else 



FIG. 180. Vaucheria synandra. 



A, a filament with archegonia and antheridia (considerably magnified) ; B, part 

 of same much more highly magnified ; o, oogonium ; a, antheridium ; C, a 

 later stage of B ; Z>, end of a filament with a zoospore, z, escaping (highly 

 magnified). 



sketch a portion showing the branching and a root-like portion. 

 Note and indicate the absence or presence and arrangement of 

 chlorophyll. Can Vaucheria probably use carbon dioxide? 



284. Reproduction in Vaucheria. Make an outline sketch of 

 fruiting organs, if found. See if any filaments can be found with 

 the contents massing or escaping at the tips. In some species 



