

1922] 



PFEIFFER — MONOGRAPH OF THE ISOETACEAE 189 



i 



Krebssee, near Heringsdorf, I. of Usedom, 9 Septembe 

 1902, without collector (U. S. Nat. Herb.); "Feldsee bei 

 Freiburg/' 7 July, 1861, Reess (U. S. Nat. Herb.) 

 Titisee near Freiburg, 1866, Magnus (U. S. Nat. Herb.) 

 Titisee, Schwarzwald, 187-, Reinsch (U. S. Nat. Herb.) 

 Feldbergsee, Schwarzwald, 30 June, 1868, Zickendrath 

 (N. Y. Bot. Gard. Herb.); on stony bottom of Feldsee 

 Feldberg, Schwarzwald, 17 July, 1834, Meisner (X. Y 

 Bot. Gard. Herb.); Einfelder See, Lauenburg, Schles- 

 wig-Holstein, Nolte 1601 (N. Y. Bot. Gard. Herb.); Titisee 

 1000 m., September, 1885, Christ (N. Y. Bot. Gard. Herb.). 

 20-50 cm. below water surface, stony substratum, in Stein- 

 see near Kirchseeon, upper Bavaria, July, 1900-01, and July 

 & August, 1902, Hepp 599 (Gray Herb.); in lake, Gardsee, 

 Ratzeburg, September, 1864, Reinke (Gray Herb.); Grosser 

 Teich, Riesengebirge, Silesia, July, 1866, Milde (Gray 

 Herb.) ; Grosser Teich, Riesengebirge, 31 July, 1874, Buch- 

 enau (Gray Herb.); Wiggoda in Moritzsee, West Prussia, 

 10 May, 1885, Lutzow (Gray Herb.); Gr. Ottalsiner See, 

 West Prussia, 10 August, 1885, Lutzow (Gray Herb.); 

 Schluchsee in Black Forest, September, 1867, without col- 



lector (Gray Herb.); Riesengebirge, 24 August, 1884 



Hieronymus (Mo. Bot:> Gard. Herb.); near Danzig, W. 

 Prussia, 1854, Klebsman (Mo. Bot. Gard. Herb.) ; millpond, 

 "Lohmulle", near Lockstedter Lager, Holstein, August, 1886, 

 without collector (Mo. Bot. Gard. Herb.). 

 Bohemia: Bistritzer See, near Eisenstein, Celakovsky 1503 (U. 



S. Nat. Herb, and Gray Herb.). 



Austria: "Grosser Teich," Sudetic Mts., Milde (Mo. Bot. Gard. 



Herb.). 



Finland : Northern Lavonia, Kvopio, 26 July, 1901, Budden (U. 



S. Nat. Herb.) ; region of Abo "par. Lojo" in lacu Hormasjo, 

 6 September, 1893, Boldt 17 (Mo. Bot. Gard. Herb.) ; same 

 station, 27 August, 1909, Boldt 418 (Mo. Bot. Gard. Herb.). 



Russia: St. Petersburg, "Hellgriindiger See in Lewaschweo," 



2-19 August, 1S98, Poring (U. S. Nat. Herb.). 



52. 1, occidental Hend. Bull. Torr. Bot. Club 27: 358. 1900 



/. lacustris var. paupercula Engelm. Trans. St. Louis Acad 

 Sci. 4: 377. 1882. 



