PLATE CIV. 



FIGS. PAGE 



1-5. Xanthidium armatum (Breb.) Rabenh. 1 and 2, 

 front views, x 500 ; 3, vertical view, x 500 ; 

 4, side view of semicell, x 430; 5, zygospore, 

 x 430. 51 



