78 ILLINOIS ACADEMY OP SCIENCE 



Spirogyra varians (Hass.) Kuetzing. 



The most abundant Spirogyra of eastern Illinois in the 

 spring. Highly variable. Found in all aquatic habitats. 

 Fruits from April to July. 

 Spirogyra Weberi Kuetzing. 



Very common throughout eastern Illinois. Usually 

 fruits in early spring. Found in all aquatic habitats. 



Mesocarpaceae 



Mougeotia Boodlei (W. & G. S. West) Collins. 



Rather frequent in ponds. Fruits both sexually and asex- 

 ually. in spring or fall or both. Fide Collins. 

 Mougeotia calcarea (Cleve) Wittrock. 



Asexually fruiting material of this species was collected 

 in the Ice Plant pond, Casey, April, 1911. 

 Mougeotia divaricata Wolle. 



This species is common in the ponds near Charleston. It 

 has been collected in a fruiting condition in summer and 

 autumn. It fruits readily when brought into the lab- 

 oratory. 

 Mougeotia genuflexa (Dillw.) Agardh. 



Very common in ponds throughout eastern Illinois. Fre- 

 quently found in a geniculate condition, but has been 

 collected in fruit only during the spring of 1912. 

 Muogeotia genuflexa gracilis (Kuetzing) Reinsch. 



Rare in wet-weather pools. Fruited in spring of 1912. 

 Fide Collins. 

 Mougeotia quadrangulata Hassall. 



Collected in a fruiting condition in Campus pond, the 

 second Big Four pond, and the pools along the Clover 

 Leaf R. R. north of Charleston, during the spring of 

 1912. 

 Mougeotia robusta (De Bary) Wittrock. 



Common. Fruiting material has been collected in the 

 pools along the Clover Leaf R. R. north of Charleston, 

 and in Campus creek. Fruits in May and June. 

 Mougeotia robusta biornata \\^ittrock. 



Common in Campus creek. Differs from the type in hav- 

 ing a pitted median spore wall. 

 Mougeotia scalaris Hassall. 



Has been collected in a fruiting condition in May in the 

 middle Tile Factory and Marshall ponds. 

 Mougeotia Transeaui Collins. 



Known only from the Embarras river near Greenup and 

 the ponds near Charleston. Fruits both sexually and 

 asexually, in fall or spring. 



