1922] 



PFEIFFER — MONOGRAPH OF THE ISOETACEAE 155 



British Isles: Wales, "In Cambriae lacu Llyn Padark," with 



/. lacustris, 30 September, 1862, Gay (Gray Herb.). 



Belgium: Genck-Limbourg, 31 July, 1865, ex herb. Thielens 



(N. Y. Bot. Gard. Herb.); "Belgium," he Roy (N. Y. Bot. 

 Gard. Herb.) ; Etang a Genck, prov. Limbourg, August, 1862, 

 Van den Bom (Mo. Bot. Gard. Herb.). 



France: Lac de Guery, Puy-de-Dome, 24 August, 1861, Durieu 



(Mo. Bot. Gard. Herb.), type; Lac de Guery, Puy-de- 

 Dome, 21 September, 1881, Heribaud (N. Y. Bot. Gard. 

 Herb.) ; Lac de Guery, August, 1890, Hy (Mo. Bot. Gard. 

 Herb.) ; Lac St. Andeol, Mt. Aubrac, 23 August, 1861, Gay 

 (Mo. Bot. Gard. Herb, and Gray Herb.) ; in Longemer, near 

 Colmar, Vosges, 26 July, 1865, Schlickum (N. Y. Bot. Gard. 

 Herb.);, Gerardmer (Vosges), August, 1867, Martin (Mo. 

 Bot. Gard. Herb, and U. S. Nat. Herb.) ; Lac de Longemer, 

 Vosges, September, 1874, Staid (Mo. Bot. Gard. Herb.); 

 Lac de Guery, August, 1890, Cosson (Gray Herb.). 



Italy: Lago d'Orta near Busca, Prov. of Novara, 15 September, 



1896, Chiovenda (Mo. Bot. Gard. Herb.); Lago d'Orta, 

 August, 1856, Franzoni (Mo. Bot. Gard. Herb.) ; borders of 

 "lacus Cusii" (lago d'Orta— Ital. bor.), 1857, Cesati (Mo. 

 Bot. Gard. Herb.). 



Norway and Sweden: in lakes of Norway, Blytt 1951 (Mo. Bot. 



Gard. Herb.); Krigsbergs, Ivarinsbruk, 17 August, 1866, 

 Duscu (U. S. Nat. Herb.) ; Nerec Gotlunda, 1864, Blomberg 

 (N. Y. Bot. Gard. Herb.) ; Nyland, Stromfors, 20 July, 1875, 

 Arrhenius (N. Y. Bot. Gard. Herb.) ; near Stockholm, An- 

 derssen (Mo. Bot. Gard. Herb.) ; Vg. Frojered, August, 

 1880, Junger (N. Y. Bot. Gard. Herb.). 



Germany: Feldsee, August, 1S46, Braun (Mo. Bot. Gard. Herb.) ; 



Titisee, Schwarzwald, August, 1864, Reess (Mo. Bot. Gard. 

 Herb, and N. Y. Bot. Gard. Herb.) ; Titisee near Freiburg, 

 August, 1864, Solms & Reess (Mo. Bot. Gard. Herb.); 

 Titisee, October, 1863, de Bary (Mo. Bot. Gard. Herb.); 

 Feldsee, Schwarzwald, September, 1861, Thiry (Mo. Bot. 

 Gard. Herb, and Gray Herb.); Feldsee in Schwarzwald / 

 1861, ex. Mus. bot Berol. (U. S. Nat. Herb., 594573) ; Titisee, 

 August, 1864, Thiry (Gray Herb.) ; Schluchsee (royal forest 

 of Baden), 1864, Braun (Gray Herb.) ; Feldsee, 1884, Christ 

 (N. Y. Bot. Gard. Herb.); ioi Feldsee, Schwarzwald, 4 



