234 Puget Sound Marine Sta. Pub. Vol. 1, No. 21 



Spirogyra dubia longiarticulata Kiitz. in Washington 



Grace A. Hill, University of Washington, Seattle. 



Filaments 43-50 fx in diameter; cells 5 diameters long; chloroplasts 

 2-3, narrow, making 1-3 turns in the cell; fertile cells slightly swollen; 

 spores brownish at maturity, ovoid-ellipsoid, about 40 yu, in diameter, 1-2 

 diameters long. (Collins.) 



Certain features of the plants examined (Plate 42) are better de- 

 scribed as follows: Filaments 42-53 fx. in diameter; cells 5-10.5 diameters 

 long; chloroplasts 2-4, 9-12 ju, wide, making 1-5 turns in the cell; pyrenoids 

 4-5 per half turn. 



Found at Seattle, Washington, Nov., 1916, in roadside ditch, by 

 A. M. Hurd. 



G. A. Hill, Del. 



PLATE 42 



Drawings, X 304. 



