76 ILLINOIS ACADEMY OF SCIENCE 



Spirogyra Grevilleana (Hass.) Kuetzing. 



Rather common in ponds, wet-weather pools, and 

 streams. Fruits during April and May. 

 Spirogyra Hassallii (Jenner) Petit. 



Rather rare in ponds near Charleston, Greenup and 

 Casey. Fruits during April and May. 

 Spirogyra lUinoiensis mss. 



A new form related to S. stictica. Differs in having larger 

 dimensions, 6-8 chromatophores, and spores with the 

 median wall punctate. Fruits in May. Known only 

 from the pond southeast of Lerna. 

 Spirogyra inconstans Collins. 



This species is abundant each year in a pond on the 

 Brookhart farm about one mile southwest of Oilfield. 

 It has also been found near Charleston and Lerna. 

 Collins does not mention the fact that the mature 

 spores have the median wall punctate. Fruits dur- 

 ing May. 

 Spirogyra inflata (Vauch.) Kuetzing. 



\^ery common in early spring in ponds, pools and ditche.*^ 

 throughout eastern Illinois. Fruits in March and 

 April. 

 Spirogyra inflata foveolata mss. 



A new variety found in the Ice Plant pond, Casey, April, 

 1911. Differs from the type in having the median wall 

 of the spore pitted. 

 Spirogyra jugalis (Dillw.) Kuetzing. 



Recorded for the middle Tile Factory pond and a small 

 pond north of Wrightsville. It probably occurs else- 

 where in this vicinity. Fide Collins. 

 Spirogyra Jurgensii Kuetzing. 



Common in ponds, pools, and streams. Fruits during 

 April and May. 

 Spirogyra longata (Vauch.) Kuetzing. 



Common, in ponds and pools. Fruits from April to June. 

 Has been collected at Lawrenceville. Charleston, Paris, 

 Westfield and Greenup. Fide Collins. 

 Spirogyra maxima (Hass.) Wittrock. 



Rare. Recorded from ponds near Charleston. 

 Spirogyra narcissiana mss. 



Found during September and October in fruit in the dam 

 at Urban Park, west of Charleston. Vegetative cells 

 somewhat like those of S. tenuissima, but the end walls 

 are different, and the spores are formed without con- 

 jugation (aplanospores). 

 Spirogyra neglecta (Hass.) Kuetzing. 



Rather common apparently in a vegetative condition, but 



