the tips; flagellum opening surrounded by a low collar; chromato- 

 phores 2, brown, parietal plates; cells 8-14//, in diameter without 

 the processes. 

 Tychoplankter. Wis. 



ORDER CHRYSOTRICHALES 



This small order includes the truly filamentous Chrysophyceae. 

 In the adult form they are branched. Palmelloid stages in the shape 

 of gelatinous strands inclosing uniseriately arranged spherical cells 

 are common. In the filamentous expression the cells are cylindrical 

 or quadrate with 2 plate-like chromatophores. In some forms there 

 are erect branches, in others prostrate discs of cells develop. Repro- 

 duction is by zoospores or resting cysts. There is one family. 



FAMILY PHAEOTHAMNIACEAE 



In this family the thallus is an erect branched filament without 

 a well-developed horizontal portion. 



PHAEOTHAMNION Lagerheim 1884, p. 3 



Thallus an attached, erect branched filament showing a central 

 axis and made up of cylindrical or somewhat inflated cells; basal 

 holdfast cell hemispherical and thick-walled; chromatophores 2 or 

 several, yellowish-brown plates; food reserve leucosin. 



PhaeotJmmnion confervicola Lagerheim 1884, p. 3 

 PI. 96, Fig. 1; PI. 99, Figs. 9, 10 



Characters as described for the genus; cells 6-1 Iju. in diameter, 

 14-20^ long. 

 Growing on Drepanocladus in 30 feet of water. Wis. 



[386] 



