74 ILLINOIS ACADEMY OF SCIENCE 



Conferva minor Klebs. 



Very abundant in all aquatic habitats during open winter 

 weather and the spring months. 

 Conferva utriculosa Kuetzing. 



Not rare in ponds in the spring. 

 Botrydium granulatum (L.) Greville. 



Apparently rare. Was found by Mr. T. L. Hankinson 

 near Charleston in October, 1903. 

 Botrydium Wallrothii Kuetzing. 



Very abundant on moist garden soil throughout the sum- 

 mer and autumn. Unlike Stichococcus flaccidus it 

 grows in full sunlight. When the resting spores are 

 formed it may assume a gray or reddish color. 



Conjugales. 

 Desmidiaceae 



Many species of Desmids occur in the collections, and the 

 periodicity of some forms has been studied. It is hoped that 

 by another year these collections will have been studied by 

 6ome one competent to name them, and a list be ready for 

 publication. 



Zygnemaceae 



Zygnema Collinsiana mss. 



A new species remarkable for its blue spores, whose 

 median wall is marked by large round pits. Found in 

 association with Zygnema stellinum in the R. R. 

 ditches between Oilfield and Casey. May, 1912. 

 Zygnema insigtie (Hass.) Kuetz. 



Common in pools, ditches, ponds, and small intermittent 

 streams. Fruits in April and May. 

 Zygnema pectinatum (Vauch.) Agardh. 



Very abundant in ponds and wet-weather pools. Fruits 

 during April, May and June. Lateral conjugation has 

 been observed in the east Big Four pond. Aplanos- 

 pores and akinetes were produced abundantly in the 

 spring of 1912. 

 Zygnema pectinatum anomalum (Rolfs) Kirchner. 



Occurs with the type. 

 Zygnema pectinatum decussatum (Vauch.) Kirchner. 



Not uncommon in ponds. As far as my observations go 

 there is little reason for considering this a variety of 

 pectinatum. In its distribution, behavior, and appear- 

 ance it appears to be quite distinct. 

 Zygnema stellinum (Mueller) Agardh. 



The most abundant of the Zygnemas of this region. It 

 occurs in ponds, pools, ditches, and intermittent 



