PAPERS BY MEMBERS 85 



est those given for Mexican specimens. Also reported 

 from New York. 

 Oedogonium Pringsheimii Norstedtii \Mttrock. 



Has been collected both in spring and fall in small quan- 

 tities during the past three years. A cosmopolitan 

 species. Known in American from Greenland, Min- 

 nesota and California. 

 Oedogonium propinquum \\'ittrock. 



Fruited during C)ctober, 1912, in the middle Tile Factory 

 pond and the east Big Four pond. Our material is 

 nearer the larger dimensions given by Hirn than the 

 smaller. Not previously reported from America. 

 Oedogonium pseudo-Boscii Hirn. 



Rather rare in the remnants of old prairie ponds. Fruits 

 during April and ^lay. Previously reported from 

 ^Massachusetts. Fide Collins. 

 Oedogonium pungens Hirn. 



Common during ]May, 1912, in permanent ponds, and 

 pools on the prairie. Distinguished from Oe. echin 

 ospermum which also occurs here by its more rounded 

 spores, and the smaller size of its vegetative cells in 

 comparison with the oogonia. Previously reported 

 from South Carolina. 

 Oedogonium pusillum Kirchner. 



Common in ponds and streams. Has been collected on 

 several occasions in fine fruiting condition, ranging 

 from ]May to September. Not previously reported 

 from America. Fide Collins. 

 Oedogonium rufescens A\'ittrock. 



The most common of the smaller Oedogoniums. Occurs 

 in ponds and temporary pools during April and May. 

 Previously reported from New England. Fide Collins. 

 Oeogonium rufescens exiguum (Elfving) Hirn. 



Not infrequently associated with the type. Not pre- 

 viotislv reported from America. 

 Oedogonium rugulosum Nordstedt. 



Collected in May, 1912, from the Ice Plant pond at Ash- 

 more. The oospore walls are very distinctly crenulate. 

 No dwarf males were present in the material. The 

 local specimens belong to the form minutum (Hans- 

 girg) Hirn. Not previously reported from America. 

 Oedogonium sociale AMttrock. 



Common in ponds. Collected once from a stream. Fruits 

 during April and ^May. Not previously reported from 

 America. Fide Collins. 

 Oedogonium suecicum Wittock. 



Not uncommon in ponds and pools. Fruits during May. 

 Previously reported from Massachusetts. 



