230 J. O. HAGSTEOM, CRITICAL RESEARCHES ON THE POTAMOGETONS. 



— Vermland, Karlstad in the Klara River, 05, Hagstkom (hb. Stockholm.)* f- mcelaren- 

 sis. — Oestrikland, Gefle, Trosken, 74, Hn (hb. Uppsal.), f. lacuum. — Helsingland, 

 Jerfso in Ufas lake, 89, Schlyter (hb. Uppsal.), f. intermedius. — Medelpad, Holm- 

 sjon, 87, TiSELius (hb. Stockholm., Uppsal.), f. subtilis passing into f. extensus. — 

 Herjedalia, Sveg in the Ljusnan, 01, Enander (hb. Stockholm., Lund.), f. spicosus, grow- 

 ing together with P. gramineus f. septenlrionalis which to a certainty is the one of 

 the parent species, — Jemtland, Ytteran, 94, Wistrobi, Refsund, Giman, Bracke, 84, 

 TiSBLius (hb. Stockholm.); Undersaker in fluvio Hjerpstrommen, 85, Sundberg (hb. 

 Stockholm.) f. perfoliatif alius; Hallesjo in Ansjon, 86, Tiselius (hb. Stockholm.), f. 

 typicus; Ansjons a, 81, Tiselius (hb. Uppsal., Lnnd.), f. lacuum; Gefsjon, 68, Kbmpe 

 and others (hb. Stockholm.), f. subtilis; Gefsjon, 85, Tiselius and others (hb. Upp- 

 sal., Lund.), f. subtilis and f. perfoliatif alius ; Marling River, 84, Tiselius (hb. Stock- 

 holm., Uppsal., laind.), f. prcelongif alius, subm. leaves as much as 140 mm long by 34 

 mm wide; Storsjon, 84, Tiselius (hb. Stockholm.), f. perfaliatifalius with transitions 

 to f. subtilis; Seman, 86, Ortendahl (hb. Lund.), f. breviar. — Norrhotten and Lap- 

 land, Pajala, L^stadius (hb. Stockholm., UjDpsal.), f. spicasus and f. Lcestadii, the 

 latter growing together with P. gramineus f. septentrionalis, lab. »alpin. X gram. v. 

 graminif alius ? At i Hn ed. I2», Almquist scrips., but anything of P. alpinus is not 

 present either in the former or in the latter of these forms; Pajala, Torne River, 

 89, Samzelius (hb. Stockholm.), f. Lcestadii, labelled with the same note; Kengis, 

 31 and 49, L^stadius and others (hb. Stockholm., Uppsal., Gothenb.), f. spicasus 

 and f. Lcestadii, the latter on a sheet together with P. gramin. f. septentrianalis and 

 with the endorsement by L^stadius: »Pat. salicifalius Wolfg. et incauta exsicca- 

 tione P. nigrescens Fr.»; Karesuando, L^stadius (hb. Stockholm.), and Vittangi, 

 Torne River, 52, Fristedt and others (hb. Stockholm.), f. spicosus; Muonio River, 

 21, Zett. (hb. Lund.) and Lycksele, 32, Zett. (hb. Lund.), f. mwlarensis; Seskar, 

 3 miles from Haparanda, Hammaren. 



Narway. Naes, Verdalen, Zett. (hb. Lund.); Mjosen, 88, Tiselius (hb. Stock- 

 holm., Uppsal., Lund.), f. intermedials; Flagsta river near Hamar, 88, Tiselius 

 (hb. Stockholm.), f. slenobasis, lab. »P. spathulcejorm,is?t>. Besides, in many places 

 together with the parent-species, from Hvaloerne — Porsgrund — Lister — Jaederen, up 

 to Hindo — Senjen— Seida, and Sydvaranger, Neiden, Foslingten, 03, Ove Dahl 

 (hb. Christianiense), f. neidensis. — Denmark, Ulse lake, SselL, 94, Baagoe (hb. 

 Uppsal., Lund.), f. typicus; Ringsted River, 99, Baagoe (hb. Stockholm.), f. sleno- 

 basis; Susaa, 94, Moller (hb. Lund.), f. lacuum; Hald lake, Jutl., 70, Nielsen 

 (hb. Uppsal.), f. typicus; Tuel lake at Soro, 46, Lange (hb. Uppsal.), f. flumineus: 

 Skserum river, Jutl., 96, Baagoe (hb. Stockholm., Uppsal., Lund.), f. robustiar; Skiern 

 river, Jutl., 47, Lange (hb. Stockholm., Uppsal.), f. typicus; Ove lake, Orum lake. 

 Fussing lake (hb. Hagstrom); Skive a, Jutl. (hb. Hagstrom), f. obtusus; Faroe Is- 

 lands, Sando, 97, Hartz and Osteneeld (hb. Stockholm., Lund.), f. typicus; Iceland, 

 Reykiavik, 76, Gronlund (hb. Uppsal.), f. typicus. — Germnny, Holstein, Nolte 

 (hb. Stockholm., Uppsal.), f. maritimus and fyrisensis; Ratzeburger See, Nolte (hb. 

 Stockholm.) and Sleswig, 74, Hinrichsen (hb. Lund.), f. typicus; Mecklenburg, Neu- 



