Plate 68 



Fig. 1. Micractiniiim qiiadrisetum (Lemm.) G. M. Smith, x 1000 



( after Smith ) 



Figs. 2, 3. Vaiicheria geminata ( Vauch. ) De Candolle, x 150 



Fig. 4. Vaucheria terrestris (Vauch.) De Candolle, x 150 



Fig. 5. Vaucheria sessilis ( Vauch. ) De Candolle, x 150 



Figs. 6, 7. Dichotomosiphon tuberosus (A. Braun) Ernst: 6, akin- 

 etes, X 75; 7, sex organs, x 25 



[796] 



