Gloeocystis planctonica (West & West) Lemmermann 1915, p. 34 



PI. 3, Figs. 10, 11 



Cells spherical or ovoid, united in free-floating gelatinous colonies 

 which are angular or pyramidal. Sheaths of each cell or group of 

 cells distinct and lamellate. Cells^4^13/A in diameter; colonies up to 

 125/x wide. 



Common in the httoral plankton of shallow lakes and ponds; inter- 

 mingled with other algae. Mich., Wis. 



Gloeocystis vesiculosa Naegeli 1849, p. 66 

 PI. 3, Fig. 15 



Cells spherical, arranged in large amorphous masses (usually at- 

 tached), inclosed by copious lamellate mucilage. Cells 4.5-12^ in 

 diameter. 



Commonly intermingled with other algae in bogs and shallow 

 lakes; on submerged aquatics. Mich., Wis. 



PALMODICTYON Kuetzing 1845, p. 155 



Thallus an anastomosing or irregularly branched gelatinous strand, 

 inclosing famihes of globose cells with individual mucilaginous 

 sheaths. Frequently several generations of cells are within a common 

 investment. Chloroplast a parietal plate covering most of the cell 

 wall, with 1 pyrenoid. 



Key to the Species 



Cells without evident individual sheaths P. varium 



Cells with distinct individual sheaths P. viride 



Palmodictyon varium ( Naeg. ) Lemmermann 1915, p. 37 



PI. 4, Figs. 3, 4 

 Thallus a simple or branched gelatinous strand, often many such 

 tubular strands radiating from a common center, containing spheri- 

 cal cells without evident sheaths in linear series or irregularly crowd- 

 ed. Cells 4-8/A in diameter; thallus 20-50/x wide. 



Entangled among dense growths of algae on submerged aquatics 

 in soft water lakes. Mich., Wis. 



Palmodictyon viride Kuetzing 1845, p. 155 

 PL 4, Figs. 5, 6 

 Thallus a branching and anastomosing gelatinous strand or cylin- 

 der in which families of globose cells are arranged in groups of 2-4 

 within a mucilaginous sheath. Cells arranged in 1 or 2 linear series, 



[85] 



