34 



Synedra tenuissima angustissima (Grun. ) Elmore. 



Synedra aciis angustissima Grrun. in V. H. Syn. 151. 1880. 

 Weeping "Water. (4716) 

 Synedra tenuissima delicatissima (W. Sm.) Elmore. 

 Synedra delicatissima W. Sm. Brit. Diat. 1 : 72. 1853. 

 Synedra acus delicatissima Grun. in VH. Syn. 151. 1880. 

 Teoumseh, Cherry county. '(4718) 

 Synedra ulna amphirhynchus (Ehr. ) Grun. 



Talmage; fossil, Mullen. (4731) 

 Synedra ulna danica (Kuetz. ) VH. 



Fairbury, Holt county. (4717) 

 Synedra ulna oxyrhynchus (Kuetz.) VH. 



Fossil, Mullen. (4732) 

 Synedra ulna vitrea (Bory) VH. 



Arago. (4733) 

 Synedra vaucheriae Kuetz, 



Lincoln. (4735) 

 Tabellaria fenestrata (Lyngb.) Kuetz. 

 Fossil, Mullen. (4734) 



ZYGNEMACEAE. 



Spirogyra jugalis (Dillw. ) Kuetz. 

 In ponds, Lincoln. (4504) 



MUCOBACEAB. 



Circinella umhellata Van. Tieg. & Le M. ' 



On horse dung, Lincoln. (4495) 

 Piptocephalis freseniana De Bary & Wor. 



On horse dung, with the preceding, Lincoln. (4494) 



PEEONOSPO EAOEAE. 



* Albugo Candida (Pars.) S. F. Gray. 



On Lepidium sativum, Lincoln. (4447) 



ULOTBICHIACEAE. 



Conferva tenerrima Kuetz., 



In tank in the zoological laboratory, Lincoln. (4496) 



