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 
Fic. 180.— Vaucheria synandra. 
A,a filament with archegonia and antheridia (considerably magnified); B, part 
of same much more highly magnified; 0, odgonium; @, antheridium; C, a 
later stage of B; D, end of a filament with a zodspore, 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 
