KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 55. NIO 5. 17 



3. f. major Tisel., 1. c, fasc. III, 1897, n. 114 — 115. — A form vulgaris with 

 more protracted internodes and often large-fruited. 



In the Svvedish herbaria this form occurs from the following places: Sweden, 

 Smoland, Loftahammar 87, Montelin 91, Floderus (hb. Uppsa].), Weslgothia, Barne- 

 sjön, 81, Nordstedt (hb. Lund.), Jemtland, Refsundssjön, Märlgåviken, 84, Tiselius 

 (hb. Stockholm., Uppsal., Lund., Gotenb.), Frösön, 70, Lenström (hb. Uppsal, et 

 Lund.); Mattmar, Drafsjön, 58, Behm (hb. Lund.). — Iceland, Myvatn, 76, Grönlund 

 (hb. Uppsal.). — Scotland, Caithness, 85, Grant (hb. Stockholm.). — Switzerland, 

 Entré Ponte et Bevers, 73, Brown (hb. Uppsal.). — France, Hautes-Alpes Lae du 

 Pontet, 94, Vieux (hb. Lund.). — Italy, In lacubus subalpestris, D:r Facchini (hb. 

 Uppsal.). 



4. f. linipes Hagstr. Potamog. from Asia in Bot. Not. 1905, 142: — Caulis 

 elongatus internodiis summis 10—15 cm.; Pedunculus 25 — 30 cm longus. 



Hitherto only known from Asia, Tibet, D:r S. Hedin (hb. Univ. Stockholm.) 

 and Norway, Senjen, 10, Notö (hb. Christian.), as far as one metre high. 



5. f. fasciculatus (Wolfg.) Hagstr., Potamogeton in Neuman, Sveriges Fl., 

 1901, 794. Cfr Tisel., 1. c. fasc. III, 1897, n. 113 et 116. — P. fasciculatus Wolfg. 

 in Schultes, Mantissa in vol. III etc. 1827, 364: — Humilissimus, pedunculis folia 

 subsequantibus. 



In shollow water at several places in Siveden (hb. Stockholm, Uppsal., Lund., 

 Gotenb.) and Norway (hb. Uppsal.). 



6. f. erinisimilis n. f. — Planta tenuissima, flexuosa, ramosissima, crinisimilis, 

 10—25 cm älta, internodiis brevissimis (inferne 3 — 5 mm), pedunculis 6 — 9 cm 

 longis, paulo superantibus. 



A very delicate plant, like a tuft of hair. It occurs in Sweden, Scania, Cim- 

 brishamn, 67, Tullberg (hb. Lund.); common in the Lake Vetter (hb. Stockholm., 

 Uppsal., Lund., Gotenb.); Bahusia, Otterön (hb. Lund.); Gestrikland, Gefle at Orarne 

 (hb. Stockholm.). — Norway, Nsesseby, 64, Henschen (hb. Uppsal.). 



7. f. polaris n. f. — Vaginae longiores (ad 25 mm), ceterum ut f. vulgaris. 

 Distribution. Nonvay, Nordland (hb. Uppsal.). — Greenland, Maneetsok, 



83, Berlin (hb. Uppsal, et Lund.), Disco near Narsak, 71, Fries (hb. Uppsal.). — 

 Italy, Piemont, Hohenacker (hb. Uppsal), Lac du Mont Cenis, Jordan (hb. Uppsal.). 



8. f. alpinus Blytt, Norges Flora I, 1861, 370: — Folia elongata, anguste 

 linearia subparallelo-patentia. Flores minimi, fruetus subglobosi. Ex Blytt et spe- 

 ciminibus dovrensibus. 



The distinguishing feature of this form or variety are the narrow (0,25 — 0,50 mm) 

 leaves, arcuately rising from the sheaths. Against the description of Blytt it has 

 hitherto in the literature incorrectly been assumed to be and described as a tall form 

 with broad leaves etc. and confounded with P. pectinatus and the hybrid P. suecicus. 



From Siveden I have not been able to get the typical plant, but something 

 like this form is found at Skellefteå (hb. Stockholm.). — Norway, Ost-Finm. Va- 

 ranger, 64, Fries (hb. Stockholm, et Uppsal.); Tana-elv between Seida and upper 

 Fingervandet, 58, Sommerfelt (hb. Stockholm, et Uppsal.); Saltö, Lillevaten, Som- 



K. Sv. Vet. Akad. Handl. Band 55. N:o 5. 3 



