1922] 



PFEIFFER — MONOGRAPH OF THE ISOETACEAE 171 



(U. S. Nat. Herb.); Poyntelle Pond, Wayne Co., 20 and 21 

 July, 1900, Chute (Mo. Bot. Gard. Herb.); Coxtown Pond, 

 Wayne Co., 20 July, 1900, Clute (Mo. Bot. Gard. Herb.). 

 Ontario: Partridge Lake, 50 mi. northeast of Bellesville, Hast- 

 ings, 21 August, 1863, John Macoun (Mo. Bot. Gard. Herb.) ; 

 Hastings, 12 July, 1870, John Macoun (Mo. Bot. Gard. 

 Herb.) ; head of ship canal, Sault Ste. Marie, 7 August, 1869, 

 John Macoun (Mo. Bot. Gard. Herb.); in Lake Superior, 

 shores of Michipicoten Isl., at Grierson's Landing, 24 July, 

 1869, John Macoun (Mo. Bot. Gard. Herb.) ; water, Nipigon 

 River, 21 July, 1884, John Macoun (Gray Herb, and N. Y. 

 Bot. Gard. Herb.); on gravel bottom, Orient Bay, Lake 

 Nipigon, midway of east shore of bay, in 2 ft. water, 23 July, 

 1911, O. E. & G. K. Jennings 6582 (Gray Herb, and U. S. 

 Nat. Herb.) ; marshes, Lake Nipigon, 10 July, 1881, John 

 Macoun (Gray Herb.) ; Nipigon River, 23 July, 1884, John 

 Macoun 14222 (Gray Herb, and N. Y. Bot. Gard. Herb.) ; 

 mouth of Nipigon River, Lake Superior, 23 June, 1884, John 

 Macoun (N. Y. Bot. Gard. Herb.); Catfish Lake, Algon- 

 quin Park, 23 July, 1900, John Macoun 24942 (N. Y. Bot. 

 Gard. Herb.); Opeonga Lake, Algonquin Park, 16 August, 

 1900, John Macoun 24940 (N. Y. Bot. Gard. Herb.). 



Michigan: Belle Isle, Detroit River, 6 August, 1871, Gillman 



Vlo. Bot. Gard. Herb.) ; Gogebic Co., summer, 1919, Dar- 

 lington (Mo. Bot. Gard. Herb.). 



Ohio: submerged in 10-20" water, Brady's Lake, Portage 1 Co., 



15-30 June, 1913, Hopkins (U. S. Nat. Herb., N. Y. Bot. 

 Gard. Herb., and Gray Herb.). 



Wisconsin: Plum Lake, Sayner, Vilas Co., summer 1918, Good- 

 speed (Mo. Bot. Gard. Herb.); muddy shore. Three Lakes. 

 Oneida Co., 13 August, 1918, Hoffman (Mo. Bot. Gard. 

 Herb.); rocky bottom, Crooked Lake, Three Lakes, Oneida 

 Co., 26 August, 1918, Hoffman (Mo. Bot. Gard. Herb.). 



Minnesota: Mountain Lake, Cook Co., 21 August, 1901, Mac- 



Millan, Brand & Lyon 177 (Mo. Bot. Gard. Herb, and Univ. 

 Minn. Herb.); small lake on Gunflint trail near 13 mile 

 post, Cook Co., 14 August, 1901, MacMillan, Brand & I^yon 

 71 (Mo. Bot. Gard. Herb, and Univ. Minn. Herb.) ; Mud 

 Lake, Cook Co., 20 August, 1901, MacMillan, Brand & Lyon 

 70 (Mo. Bot, Gard. Herb.); Echo Lake, Mahtomedi, 14 



