|  | site | site # (info) | collection date | kind | depth | substrate | salin | comments | reference | 
| A | North of Vaag (Sudero), Faroes, Ryskidalur Lake, Faroe Islands | 366 
  map | 1926 |  |  |  | Freshwater | in bog-pool, several specimens | Steinböck O (1931): 3 | 
| B | Skutustaoir, north Iceland | 597 
  map | Jul 1-Aug2, 1937 |  |  |  | freshwater | pool near Skutustaoir, 2 specimens. | Steinböck O (1948): 9 | 
| C | North of Vaag (Sudero), Faroes, Ryskidalur Lake, Faroe Islands | 366 
  map | Jun 22-Jul 19, 1928 |  |  |  | freshwater | several specimens,  280 meters above seal level, in a bog-pool of Ryskidalur | Steinböck O (1931): 3 | 
| D | Neudorf, Switzerland | 1949 
  map | prior to 1894 | type locality |  |  | freshwater |  | Fuhrmann O (1894): 218-222, 273 | 
| E | Sweden (Schweden) | 2625 
  map | 1913 or earlier |  |  |  | freshwater |  | Graff Lvon (1913): 102 | 
| F | Lule Lappmark (Lule Lappmarken), Sweden | 2881 
  map | 1932 or earlier |  |  |  | freshwater | pools, moor pools, small lakes. | Steinböck O (1932): 307 | 
| G | Torne Lappmark (Tornea Lappmark), Sweden | 2882 
  map | 1932 or earlier |  |  |  | freshwater | pools, moor pools, small lakes. | Steinböck O (1932): 307 | 
| H | Kola Peninsula (Halbinsel Kola, Alexandrowsk, Kandalakscha, Kantalahti, Alexandrovsk), Russia | 1263 
  map | 1932 or earlier |  |  |  | freshwater |  | Steinböck O (1932): 307 | 
| I | Llyn Cwellyn (Quellan), Caernarvonshire (Caernarvon, Carnarvonshire, Arfon), North Wales, United Kingdom | 3340 
  map | Nov 1968 - Oct 1969 |  | littoral |  | freshwater | calcium poor lake (1.7 mg/l). | Young JO (1973): 204 | 
| J | Llyn Ogwen, Caernarvonshire (Caernarvon, Carnarvonshire, Arfon), North Wales, United Kingdom | 3345 
  map | Nov 1968 - Oct 1969 |  | littoral |  | freshwater | calcium poor lake (0.4 mg/l). | Young JO (1973): 204 | 
| K | Llyn Cwellyn (Quellan), Caernarvonshire (Caernarvon, Carnarvonshire, Arfon), North Wales, United Kingdom | 3340 
  map | Jul 1969 |  |  |  | freshwater | littoral zone of upland, calcium-poor 'unproductive' lakes in Caernarvonshire, N. Wales. | Young JO (1972): 356-357 | 
| L | Llyn Ogwen, Caernarvonshire (Caernarvon, Carnarvonshire, Arfon), North Wales, United Kingdom | 3345 
  map | Jul 1969 |  |  |  | freshwater | littoral zone of upland, calcium-poor 'unproductive' lakes in Caernarvonshire, N. Wales. | Young JO (1972): 356-357 | 
| M | Leningrad Province (Sankt-Peterburg, Saint Petersburg), Russia | 3893 
  map | 1926 or earlier |  |  |  |  | Leningrad province. | Nasonov NV (1926): abstract | 
| N | Mästermyr, Gotlands Län, Sweden | 5010 
  map | 1907 or earlier | default type |  |  |  | Mehrere Lokale im Mästermyr, ferner einige Exemplare in einem Teiche nahe Upsala. | Hofsten N v (1907): 13 | 
| O | Uppsala (Upsala), Sweden | 4032 
  map | 1907 or earlier | default type |  |  |  | Mehrere Lokale im Mästermyr, ferner einige Exemplare in einem Teiche nahe Upsala. | Hofsten N v (1907): 13 | 
| P | Hahnensee, Switzerland | 4124 
  map | 1911 or earlier |  |  |  | freshwater | Hahnensee (2156 m ü. M.). | Hofsten N v (1911): from Hofsten 1912 (citation)- p. 614 | 
| Q | Lej da Staz (Stazersee), Switzerland | 4125 
  map | 1911 or earlier |  |  |  | freshwater | Lej da Staz (1808) nahe bei St. Moritz. | Hofsten N v (1911): from Hofsten 1912 (citation)- p. 614 | 
| R | Berninapass (Bernina Pass, Passo de Bernina), Switzerland | 4126 
  map | 1911 or earlier |  |  |  | freshwater | Lej Pitschen am Bernina-Pass (2220 m). | Hofsten N v (1911): from Hofsten 1912 (citation)- p. 614 | 
| S | Sarek mountains (Sarekgebirge), Sweden | 2880 
  map | 1916 or earlier |  |  |  |  | Nordschwed.  Hochgebirge Sarek u. Torne Lappmark | Hofsten N v (1917): from Luther 1955 (citation)- p. 246 | 
| T | Torne Lappmark (Tornea Lappmark), Sweden | 2882 
  map | 1916 or earlier |  |  |  |  | Nordschwed.  Hochgebirge Sarek u. Torne Lappmark | Hofsten N v (1917): from Luther 1955 (citation)- p. 246 | 
| U | Murmansk (Muurmanni, Gorod Murmansk), Russia | 3032 
  map | 1925 or earlier |  |  |  |  | Murmansk. | Nasonov NV (1923): and Nasonov 1925 (citation);  from Luther 1955 (citation)- p. 246 | 
| V | Kittilä (Kittila), Finland | 2979 
  map | 1955 or earlier |  |  |  |  | (Karling, Luther & Papi) | Luther A (1955): 246 | 
| W | Sotkajärvi, Finland | 4990 
  map | 1955 or earlier |  |  |  |  | (Karling, Luther & Papi) | Luther A (1955): 246 | 
| X | Sirkka (Sikkola), Finland | 2981 
  map | 1955 or earlier |  |  |  |  | (Karling, Luther & Papi) | Luther A (1955): 246 | 
| Y | Kandalaksha (Kantalahti, Kandalakscha, Kandalaska, Kandalasksa), Russia | 5575 
  map | 1925 or earlier |  |  |  |  |  | Nasonov NV (1923): and Nasonov 1925 (citation);  from Luther 1955 (citation)- p. 246 | 
| Z | Hiitis (Hiittinen, Hitis), Finland | 5832 
  map | 1955 or earlier |  |  |  |  | (A.L. in Proben von Hans Luther) | Luther A (1955): 246 | 
| A1 | Hitis-Vänö-Archipel, Finland | 5895 
  map | 1955 or earlier |  |  |  |  | (A.L. in Proben von Hans Luther) | Luther A (1955): 246 | 
| B1 | Brännskär (Brannskar, Brenskar, Brannskaret, Brandskar), Finland | 5757 
  map | 1955 or earlier |  |  |  |  | Teich auf Schäre zwischen Vettaskär in SW u. Brännskär in NO (A.L. in Proben von Hans Luther) | Luther A (1955): 246 | 
| C1 | Tenala (Tenhola), Finland | 2974 
  map | 1955 or earlier |  |  |  |  | (A.L.) | Luther A (1955): 246 | 
| D1 | Skogbyträsket (Skogbyträsk, Skogby träsk), Finland | 5674 
  map | 1955 or earlier |  |  |  |  | (A.L.) | Luther A (1955): 246 | 
| E1 | Vitträsk, Finland | 5616 
  map | 1955 or earlier |  |  |  |  | Södra Vitträsk (A.L.) | Luther A (1955): 246 | 
| F1 | Lohjanjarvi (Lohjanjärvi, Lojo-See, Lojosjö, Lojosee), Finland | 2986 
  map | 1955 or earlier |  |  |  |  | Lojo-See u. Tümpel an seinem Ufer | Luther A (1955): 246 | 
| G1 | Hormajarvi (Hormajärvi), Finland | 3029 
  map | 1955 or earlier |  |  |  |  |  | Luther A (1955): 246 | 
| H1 | Routio, Finland | 4801 
  map | 1955 or earlier |  |  |  |  | Waldsumpf bei Routio | Luther A (1955): 246 | 
| I1 | Hanko (Hangö, Hango, Hangonkyla, Khanko) Penninsula, Finnish Bay, Finland | 3036 
  map | 1955 or earlier |  |  |  |  | Hangö, Teich im Stadtpark. | Luther A (1955): 246 | 
| J1 | Tvärminneträsket (Tvärminne träsk, Tvärminneträsk), Finland | 5907 
  map | 1955 or earlier |  |  |  |  | Tvärminne träsk | Luther A (1955): 246 | 
| K1 | Sandöträsket (Sandträsk), Finland | 4809 
  map | 1955 or earlier |  |  |  |  |  | Luther A (1955): 246 | 
| L1 | Zoologischen Station Tvärminne (Tvarminne), Hanko (Hango, Hangö), Finnish Bay, Finland | 1378 
  map | 1955 or earlier |  |  |  |  | Kasbergskärret | Luther A (1955): 246 | 
| M1 | Vikarskär (Vikarskar, Vikarskären, Storlandet), Finland | 2860 
  map | 1955 or earlier |  |  |  |  | Storlandet, vegetationsreicher Tümpel | Luther A (1955): 246 | 
| N1 | Langskar (Långskär), Finish Gulf, Finland | 878 
  map | 1955 or earlier |  |  |  |  | Långskärs träsk u. verschiedene vegetationsreiche Felstümpel | Luther A (1955): 246 | 
| O1 | Syndalen, Finland | 3028 
  map | 1955 or earlier |  |  |  |  | Lagunen bei Syndalen. | Luther A (1955): 246 | 
| P1 | Lappohja (Lappvik), Finnish Bay (Finnischen Meersbusen), Finland | 887 
  map | 1955 or earlier |  |  |  |  | grosse Lagune u. Tümpel auf dem Sandstrand. | Luther A (1955): 246 | 
| Q1 | Pohjanlahti (Pojo Wiek, Pojowiek, Pojoviken, Pohjanpitäjanlahti), Finland | 5465 
  map | 1955 or earlier |  |  |  |  | innerster Teil, Klockarudden an Bällen von Cladophora aegagropila. | Luther A (1955): 246 | 
| R1 | Ekenas (Ekenäs, Tammisaari, Tammisari), Finland | 2932 
  map | 1955 or earlier |  |  |  |  |  | Luther A (1955): 246 | 
| S1 | Algsjo (Elgo, Olishe Landet, Elgsjo, Elgö), Finland | 2933 
  map | 1955 or earlier |  |  |  |  |  | Luther A (1955): 246 | 
| T1 | Storträsk, Finland | 5676 
  map | 1955 or earlier |  |  |  |  | Nästräsk u. Storträsk | Luther A (1955): 246 | 
| U1 | Gvardeyskoye (Гвардейское, Karisalmi), Russia | 5685 
  map | 1917 or earlier |  |  |  |  | Karisalmi bei Viborg (= Viipuri), Seen Salojärvi u. Tervajärvi. | Nasonov NV (1917): from Luther 1955 (citation)- p. 246 | 
| V1 | Salojärvi, Finland | 5826 
  map | 1917 or earlier |  |  |  |  | Karisalmi bei Viborg (= Viipuri), Seen Salojärvi u. Tervajärvi. | Nasonov NV (1917): from Luther 1955 (citation)- p. 246 | 
| W1 | Tervajärvi, Finland | 5932 
  map | 1917 or earlier |  |  |  |  | Karisalmi bei Viborg (= Viipuri), Seen Salojärvi u. Tervajärvi. | Nasonov NV (1917): from Luther 1955 (citation)- p. 246 | 
| X1 | Leningrad Province (Sankt-Peterburg, Saint Petersburg), Russia | 3893 
  map | 1924 or earlier |  |  |  |  | Umgebung v. Leningrad, Gorwaldai-See | Beklemischev VN (1921): and Nasonov 1924 (citation); from Luther 1955 (citation)- p. 246 | 
| Y1 | Vladimir (Wladimir), Russia | 6928 
  map | 1924 or earlier |  |  |  |  | Gouv. Vladimir | Nasonov NV (1924): rom Luther 1955 (citation)- p. 246 | 
| Z1 | Ivanovo (Ivanovo-Vosnesensk, Ivanovo-Voznesensk, Ivanovo-Vosnessensk Иваново, Iwanowo), Russia | 5751 
  map | 1923 or earlier |  |  |  |  | Gouv. Ivanovo Voznesensk | Cordé WJ (1923): from Luther 1955 (citation)- p. 246 | 
| A2 | Pfal (Bayrischer Pfahl, Bayrische Pfalz), Germany | 5789 
  map | 1955 or earlier |  |  |  |  | Bayrische Pfalz, Weiher in d. Nähe v. Johanniskreuz (A.L.) | Luther A (1955): 246 | 
| B2 | Johanniskreuz, Germany | 5830 
  map | 1955 or earlier |  |  |  |  | Bayrische Pfalz, Weiher in d. Nähe v. Johanniskreuz (A.L.) | Luther A (1955): 246 | 
| C2 | Tatras, Poland | 5570 
  map | 1939 or earlier |  |  |  |  |  | Gieysztor M (1939): from Luther 1955 (citation)- p. 246 | 
| D2 | Saint Moritz (Sankt Moritz-Dorf, Sankt Murezzan), Switzerland | 4149 
  map | 1911 or earlier |  |  |  |  | Seen bei St. Moritz 1808 u. 2156 m ü.M. | Hofsten N v (1911): from Luther 1955 (citation)- p. 246 | 
| E2 | Saint Moritz (Sankt Moritz-Dorf, Sankt Murezzan), Switzerland | 4149 
  map | 1912 or earlier |  |  |  |  | Bernina-Pass, Lej Pitschen, 2220 m ü.M. | Hofsten N v (1912): from Luther 1955 (citation)- p. 246 | 
| F2 | Tomsk, Siberia, Russia | 2631 
  map | 1921 or earlier |  |  |  |  |  | Beklemischev VN (1921): from Luther 1955 (citation)- p. 246 | 
| G2 | Southern Urals | 7270 
  map | 2011 or earlier |  |  |  |  | ....lakes of the southern Urals and in environs of Rybinsk reservoir (the Volga River basin). | Rogozin AG (2011): abstract | 
| H2 | Rybinskoye Vodokhranilishche (Shcherbakov, Rybinsk), Russia | 3422 
  map | 2011 or earlier |  |  |  |  | ....lakes of the southern Urals and in environs of Rybinsk reservoir (the Volga River basin). | Rogozin AG (2011): abstract |