III. LIST OF FRESH-WATER ALGAE COLLECTED 

 IN MINNESOTA DURING 1896 AND 1897. 



Josephine E. Tilden. 



During the past two years no special effort has been made to 

 collect the algae of the State. Several species have been given 

 particular study in the laboratory and a few others have inci- 

 dentally been brought to notice. The list comprises only those 

 not heretofore recorded in Minnesota, and is a continuation of 

 the series begun in Vol. I. of this publication. Attention may 

 be called to the comparatively large number of lime-secreting 

 forms. 



HELMINTHOCLADIACE^ (Harv.) Schmitz Syst. Uebers. 

 Florid, in Flora 4. 1889. 



240. Chantransia pygmaea (Kg.) Sirdt. Les Batracho- 



spermes. 244, 245. 1884. 

 Together with Chaetofhora calcarca, Dicothrix cal- 



carca, Lyngbya martcnsiana var. calcaj'ca and L. 



nana, forming the calcareous crust on sides of old 



tank and on twigs in the water. 

 Minneapolis, Minnesota. October i, 1895. 



241. Chantransia expansa Wood. Contr. Hist. Fresh-Water 



Algae North Am. 215. pi. 19. f. 2. 1872. 

 On stones under waterfall. Osceola, Wisconsin. Sep- 

 tember 15, 1897. 



CHARACEAE Richard in Humb. et Bonpl. Nov. G. I. 1815. 



242. Chara contraria A. Br. Schweizer. Char. 15. 1847. 

 In ditches. Osceola, Wisconsin. August 31, 1895. 



243. Chara foetida A. Br. Ann. Sci. Nat. Bot. II. i : 354. 



1834. 

 In pool formed b}' spring water. Osceola, Wisconsin. 

 September 15, 1897. 



