PLATE 23 

 FIG. PAGE 



GYROSIGMA 



1 Gyrosigma strigilis (Wm. Sm.) Cl 76 



2 Gyrosigma balticum (Ehr.) Cl 75 



3 Gyrosigma hippocampus (Ehr.) 75 



4 Gyrosigma simile (Grun.) 76 



5 Gyrosigma acuminatum (Kuetz.) Cl 76 



6 Gyrosigma scalproides (Rab.) Cl 76 



7 Gyrosigma parkeri var. stauroneioides Grun 75 



8 Gyrosigma spencerii var. nodifera Grun 76 



9 Gyrosigma fasciola (Ehr.) Cl 77 



