110 

 70. Xanthidium: 



(Fig. sinistra: X. armatum, fig. dextra: X. aculatum.) 

 1. 2. 





Cellula a fronte conspecta, fig. 1. processibus, fig. 2. a. aculeis subulatis 

 instructae, b. cellula a latere conspecta. 



71. Arthrodesmus : 



(A. convergens.) 



/ ( \ /■■'■■, /, >._ Cellulae angulis in aculeum 

 Jj|| plus minus elongatum achroum 

 W : p/ productis. 



Familia II. Zygnemaceae. 



72. Rhynchonema: (quadratum.) 



Copulatio (lateralis) fit inter fili continui cellulas duas vicinas (b. c.) ; 

 fig. d. zygospora intra cellulam matricalem ; x. x. cytioderma replicatum. 



