84 ILLINOIS ACADEMY OF SCIENCE 



Oedogonium irregulare \\'ittrock. 



This has been previously collected by Wolle in Florida. 

 Here I have observed it only in Hodgen's pond fruit- 

 ing in September. 

 Oedogonium macrandrium aemulans Hirn. 



Found in the Ice pond, Ashmore, during October, 1912. 

 Has been previously reported from Pennsylvania and 

 California. 

 Oedogonium Magnusii W'ittrock. 



Rather common. Recorded from the Tile Factory ponds, 

 railroad pools, Charleston, and the Ice pond, Ashmore. 

 Distinguished by the pitted median membrane of the 

 oospore from others of about the same dimensions. As- 

 sociated commonly w^ith Oe. rufescens. 

 Oedogonium multisporum Wood. 



Common in small streams, occasionally found in ponds 

 and pools. Usually fruits in May and June. Recorded 

 from Butler's creek and first Tile Factory pond, Char- 

 leston, the pond north of Wrightsville, and the rail- 

 road pool near Sullivan. Fide Collins. 

 Oedogonium oblongum A\'ittrock. 



Not previously collected in North America. Here found 

 associated with Confervas in pools along the Clover 

 Leaf R. R. north of Charleston, October, 1910. 

 Oedogonium obtruncatum Wittrock. 



A form evidently belonging here w^as collected in the 

 east Big Four pond' November, 1912. The dimensions 

 are slightly larger than those given by Hirn for the 

 variety completum. 

 Oedogonium paludosum (Hass.) Wittrock. 



Found in the pond near Lerna, in May, 1912. Reported 

 by \A\)lle, from Pennsylvania. 

 Oedogonium paludosum parvisporum 



Rather common in the remnants of old prairie ponds near 

 Charleston. Fruits in April and May. Not previously 

 reported from America. 

 Oedogonium plagiostomum Wittrock. 



Collected from the middle Tile Factory, and west Big 

 Four ponds near Charleston, during October, 1912. Of 

 special interest is the presence of antheridial filaments. 

 The extremes of the dimensions for the oogonium are 

 • slightly larger than those given by Hirn. Known pre- 

 viously only from Sweden and Denmark. 

 Oedogonium plagiostomum gracilius Wittrock. 



Not uncommon during ^lay and June. In addition to the 

 Charleston ponds, I have collected it from the Lily 

 pond, southeast of Newton. The dimensions are near- 



