230 J. O. HAGSTRÖM, CRITICAL RESEAKCHES ON THE POTAMOGETONS. 



— Vermland, Karlstad in the Klara River, 05, Hagstköm (hb. Stockholm.), f. malarcn- 

 sis. — Geslrihland, Gefle, Trösken, 74, Hn (hb. Uppsal.), f. lacuum. — Hälsingland, 

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

 sjön, 87, Tiselius (hb. Stockholm., Uppsal.), f. subtilis passing into f. cxtensus. — 

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

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

 the parent species. — Jemtland, Ytterån, 94, YViström, Refsund, Gimån, Bräeke, 84, 

 Tiselius (hb. Stockholm.); Undersåker in fluvio Hjerpströmmen, 85, Sundberg (hb. 

 Stockholm.) f. perfoliatifolius; Hällesjö in Ansjön, 86, Tiselius (hb. Stockholm.), f. 

 typicus; Ansjöns å, 81, Tiselius (hb. Uppsal., Lund.), f. lacuum; GJefsjön, 68, KempE 

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

 sal., Lund.), f. subtilis and f. perfoliatifolius; Märling River, 84, Tiselius (hb. Stock- 

 holm., Uppsal., Lund.), f. prcelongifolius, subm. leaves as much as 140 mm long b}^ 34 

 mm wide; Storsjön, 84, Tiselius (hb. Stockholm.), f. perfoliatifolius with transitions 

 to f. subtilis; Semån, 86, Örtendahl (hb. Lund.), f. brevior. — Norrbotten and Lap- 

 land, Pajala, L^estadius (hb. Stockholm., Uppsal.), f. spicosus and f. Lcestadii, the 

 latter grovving together with P. gramineus f. septenlrionalis, lab. »alpin. X gram. v. 

 graminifolius? At i Hn ed. 12», 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^estadius and others (hb. Stockholm., Uppsal., Gothenb.), f. spicosus 

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

 with the endorsement by Ljestadius: »Pot. salicifolius Wolfg. et incauta exsicea- 

 tione P. nigrescens Fr.»; Karesuando, Ljestadius (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. malarcnsis; Seskar, 

 3 miles from Haparanda, Hammaren. 



Norway. Naes, Verdalen, Zett. (hb. Lund.); M josen, 88, TiSELIUS (hb. Stock- 

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

 (hb. Stockholm.), f. stcnobasis, lab. »P. spathukeformish. Besides, in many places 

 together with the parent-species, from Hvalöerne— Porsgru nd — Lister — Jaederen, up 

 to Hindö— Senjen— Seida, and Sydvaranger, Neiden, Foslingtcn, 03, Ove DAHL 

 (hb. Christianiensc), f. neidensis. — Den mar/:, Ulse lake, Saell., 94, Baacöi: (hb. 

 Uppsal., Lund.), f. typicus; RingSted River, 99, BaagöE (hb. Stockholm.), f. steno- 

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

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

 Skaerum river, Jutl., 96, BaagÖe (hb. Stockholm., Uppsal., Lund.), f. robuslior; Skiern 

 river, .Intl., 47, Lange (hb. Stockholm., Uppsal.), f. typicus; Ove lake, öram lake 

 Fussing lake (hb. Hagström); Skive å, Jutl. (hb. Hagström), t', obtusus; Farot Is- 

 lands, Sandö, 97, Makt/ and OSTENFELD (hb. Stockholm., Lund.), t. typicus; ledand, 

 Reykiavik, 76, Gbönlujti) (h)>. Uppsal.), f. typicus. — Oermany, Holstein, Nolte 

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

 Stockholm.) and Sleswig, 74, Hinhiciisen (hb. Lund.), f. typicus; Mecklenburg, Ncu- 



