Plate 11 



Figs. 1, 2. Stigeoclonium flagelliferum Kuetzing, x 440 



Fig. 3. Stigeoclonium stagnatile ( Hazen ) Collins, x 440 



Fig. 4. Microthamnion Kuetzingianum Naegeli, x 440 



Figs. 5, 6. Microthamnion strictissimum Rabenhorst: 5, x 1000; 6, 

 base of plant, x 1000 



[682] 



