. Critical researches on the potamogetons. [Ti coll. J. A. Holm) is misreported by E. Collinder, Medelpads Flora, 1909, 179. The plant referred to is P. zosterijolius, which has spread more northwardly (see p. 66). On the west coast a single station is recorded, viz. Oothenburg, 53, Krok, Lindbeeg and many others in later times (hb. Stockholm., Uppsal., Lund, et Gothenb.). The statement from Nonvay (Skien) Blytt, Norges Flora I, 1861, 368, is a mistake instead of P. mucronatus (see under that species!) according to Blytt's examples as well as A. Blytt, C Z;^ Norges Flora I, 1902, 49. The north
. Critical researches on the potamogetons. [Ti coll. J. A. Holm) is misreported by E. Collinder, Medelpads Flora, 1909, 179. The plant referred to is P. zosterijolius, which has spread more northwardly (see p. 66). On the west coast a single station is recorded, viz. Oothenburg, 53, Krok, Lindbeeg and many others in later times (hb. Stockholm., Uppsal., Lund, et Gothenb.). The statement from Nonvay (Skien) Blytt, Norges Flora I, 1861, 368, is a mistake instead of P. mucronatus (see under that species!) according to Blytt's examples as well as A. Blytt, C Z;^ Norges Flora I, 1902, 49. The northern limit of P. acutifolius in the Scandinavian Peninsula thus runs from Orbyhus (Upp- land) to Orebro {Nericia) and Gothenburg. The species, how- ever, does not appear equally scat- tered over the whole area to the south of this line, but in three isolated small districts: 1) a west- ern one: Gothenburg, 2) a south area: Scania with south Halland, and 3) a northern, larger district. The stations within this last one, strange to say, seem to be situ- ated on the old bottom of the Li- torina Sea. Hence we might per- haps suppose P. acutifolius to be a rather recent plant-immigrant to Sweden. Extra-scandinavian stations: ,„„,.„ „ „ .„ ^ , Denmarh, near Copenhagen etc. Fig. 28. A—E, P. sudevmaniciis Hagstr., is P. pusilhis L. — yl, ' x o Basal portion of a stem-leaf, V; -S, Transverse section of a stem-leaf at (hb. Stockholm., XJppSal. Ct Lund.). the middle, '^^, m, midvein, 71', lateral nerves, Z, lacnuar system, sty, ^ , . /-Ul, mechanical strands, the marginal bundle very strong; C, Transverse sect, \'iy^ SCVCral plaCCS (HD. of the stem, ^{"^ cc, central axis, sir, subepidermal strands; D, Longitudinal Qfr^/^lr-hrilm TT-nt-iaQl t^f T itnri ^ section of the epidermis, Y; -'?. Transverse sect, of the peduncle, »^, showing iJtOCKllOim., Uppsai. GZ ). .two median (vh) and two lateral vascular bundles and a single subepidermal FfdnCC SCVCral &
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Keywords: ., bookcentury1900, bookcollectionbiod, bookdecade1910, bookyear1916
