102 



J. O. HAGSTROM, CRITICAL RESBARCHES ON THE POTAMOGETONS. 



transformation of the tops of the secondary branches. Those buds break separately 

 when they reach their maturity. Moreover they are considerably larger and the lower 

 free leaves are similar to the other leaves of the braneh. Cfr Hagström in Neuman, 

 Sveriges Flora 1901, p. 802—803. 



Very rarely there are turios on the rhizomes. As to their appearance it is 

 traced in fig. 39, D. 



Beside the main-form and v. minor Biv. Fischer has established two inter- 

 mediate forms: vulgär is and rutiliformis. Of var. minor he discerns fonr forms: ra- 

 mosus, squarrosus, / platycai"pus and stcnocarpus. Forma ligulifolius Fisch. is the form 



endowed with somewhat subcoriaceous invo- 

 lucral leaves. See Fischer, Die bayer. Pot. 

 1907, 109-110. 



A still more broad-leaved form than the 

 main-form I have found in some herbaria and 

 named 



f. austrinus n. f. — Folia latiora, 1,5 — 1,75 

 mm lata. 



This form is met with in Africa. The 

 broad-leaved forms seem to spread southward 

 from the Mediterranean, and the narrow-leaved 

 to the north of it. 



Distribution. Sweden. Generally not 

 far from the Baltic and Bothnian coasts and 

 of ten in brackish water. Scania, Vegeholm, 

 88, Wallengren (hb. Uppsal.), Lund, 45, 



Fig. 39./'. panormttanm Ttav. P minor Bry. a. B, L — M in hb. E. FRIES (llb. Uppsal.), Ringsjön, 

 Two tnrios, V, «, Btem, b, leaf, //, turio, f, prophylram, _~ -. T ., , x , , ,, 



i, scaic-kaf. c. sysun. fil t.nins. oat. si/,.. B ee ti.o 82, Nilsson (hb. Lund., on a sheet together 



text] D, Bhizomatic tnrios (Ä— A), \, 1, 2, 3, 4, inter- -,i ^i } iv } ir jd P nnnnn» V tr»ltoll) Tlio 



nodes. E, Transreree section of a young ligule at the " iru inc n y Dria *■ pallOI m. X pu&Ul.). Ult 



middie abowing the form and the bnndiea, ••,", ". f"-" 1 original Friesian specimen of P. qracilis from 



field. F, Voung lignle, backfield-view, \, sbowing tlie » 



top-form of the frent-fleld and how far in some inetanoea Landskrona is not present ill tlie MuseillllS. — 



the apical sht of Un- back field can oxtend downwarda -~ , ,, . t» , -,-, , „ n 



(dotted ii... Ostroqothia, Borensberg, Brunneby par., 73, 



Bergström (hb. Uppsal.) Vreta, Berg, 88, 

 Aurelius (hb. Lund.), Tåkern, 83, Tollin (hb. Lund.), Linköping, Kattbrunnen, 

 Sanden and others (hb. Uppsal, et Lund.), Grebo, Redinge, Sanden (hb. Uppsal.), 

 Norrköping, 56, Hammarsten (hb. Uppsal.). — Westgolhia, Gothenburg, Kville- 

 bäckcn, Lindholmen and G ullbergs vass, Lindeherg (hb. Gothenb.). - Stockholm, 

 Värmdön, Rörsundsvik and some other places (hb. Stockholm., Uppsal., Lund.). — 

 Sudermania: Igelsta in II allsfjärden, 97, Hagström (hb. ELåGSTR.). — Gestricia, 

 Gefle, Hillevik in sinu maris, 47, Hartman, 35, Tiiedenius (hb. Uppsal.). — Medel- 

 pad, Skön, Fillan, 79, Setii (hb. Lund.). - Wcdbolhnia, Kålan in atpia salsa, 68, 

 Krok (hb. Stockholm.). — Dalecarlia, Hedomora, 02, Tiselius (hb. Stockholm.). 



Norivay, Flagsta-rivcr, 88, TlSBLIUS (hb. Stockholm.). — Dcnmark, Husum, 46, 

 L\n<;e (hb. Uppsal.), Jiitlaiid, Nybro K ro, 96, Baagöe (hb. Uppsal.), Braband sö, 



