PL 116. 



a 



d 

 Staurastrum dejectum 



a b 



Staurastrum crenulatum 



u b 



Staurastrum tricorne 



Staurastnum verticillatum 



a b 



Staurastrum gracile 



a b 



Staurastrum brevispina 



a b 



Staurastrum tetracerum 



n b 



Staurastrum avicula 



a b 



Staurastrum aculeatum 



a b 



Staurastrum orbiculare 



a b 



Staurastrum Mandfeltii 



VII. CONJUGATE 



a b 



St. pileotatum 



a b 



Staurastrum sexangulare 



a b 



Staurastrum furcigerum 



3. Desmidiacese 



