Tilden: LIST OF fresh water algae. 29 



47. Penium polymorphum Perty. Kleinste. Lebensf. 207. 



1852. 



Peat-bog near lake Kilpatrick. July 13, 1893. 



48. Closterium strigosum Breb. Liste. Desm. 153. 1856. 



Lake Kilpatrick. July 3, 1893. 



49. Closterium niacilentum Breb. Liste. Desm. 153. 1856. 



Lake Kilpatrick. July 3, 1893. 



50. Closterium kuetzingii Breb. Liste. Desm. 156. 1856. 



Pool near lake Kilpatrick, July 10, 1893. 



51. Closterium parrulum Naeg. Einz. Alg. 106. 1849. 



Marsh near lake Kilpatrick. July 11, 1893. 



52. Closterium ensis Delp. Spec. Desm.. subalp. 219. 1873. 



Minneapolis. Oct. 5, 1893. 



53. Pleurotaenium trabecula (Ehrenb.) Naeg. Einz. Alg. 



104. 1849. 

 Pool near lake Kilpatrick. July 8, 1893. 



54. Cosmarium tumidnm Lund. Desm. Suec. 45. 1871. 



Mud lake. June 29, 1893. 



55. Cosmarium brebissoni Menegh. Linnaea 14:210. 



1840. 

 Peat bog near lake Kilpatrick. July 14, 1893. 



56. Disphiiictium notabile ('Breb. '?) Hansg. Prodr. Alg. 



186. n. 358. 1886- 88. 

 Stony brook. July 14, 1893. 



57. Cosmarium ansatum (Ehrenb.) Kg. Spec. Alg. 174. 



1849. 

 Home brook. July 22, 1893. 



58. Xanthidium torreyi Wolle. Bull. Torr. Bot. Club 



12:3. 1885. 

 Pool south of lake Kilpatrick. July 5, 1893. 



59. Xanthidium fasciculatum Ehrenb. Infus. 146. n. 169. 



1838. 

 Marsh near Monroe. July 12, 1893. 



60. Anthrodesmus incus (Breb.) Hass. Freshw. Alg. 357. 



n. 2. 1852. 

 Pool near Monroe. July 12, 1893. 



61. Micrasterias radiosa Ag. Flora. 10 : 643. 1827. 



Peat-bog near lake Kilpatrick. June 26, 1893 



