. Critical researches on the potamogetons. 220 J. O. HAGSTEOM, CRITICAL RESEABCHES ON THE POTAMOGETONS. spathulatus M. & K.»; Umenaii, 86, C. Noldeke (hb. Breman.); Berlin, Potsdam, Havel bei Baumgartenbriick, 83, Scheppig (hb. Brem.); more dubious forms are seen from Schlesien (Silesia), Vratislavia, 64, Uechtritz (hb. Stockholm.), and Nassau, 83, TiSELius (hb. Stockholm.). — England, Surrey, 86, Bennett (hb. Stockholm.); Yorkshire, River Ure near Ripon, 80, Nicholson (hb. Lund.), labelled: P. polygoni- folius PouRR; Shobden March, Herefordshire, 89, Rev:d A. Ley (hb. Ar. Bennett). — Irel
. Critical researches on the potamogetons. 220 J. O. HAGSTEOM, CRITICAL RESEABCHES ON THE POTAMOGETONS. spathulatus M. & K.»; Umenaii, 86, C. Noldeke (hb. Breman.); Berlin, Potsdam, Havel bei Baumgartenbriick, 83, Scheppig (hb. Brem.); more dubious forms are seen from Schlesien (Silesia), Vratislavia, 64, Uechtritz (hb. Stockholm.), and Nassau, 83, TiSELius (hb. Stockholm.). — England, Surrey, 86, Bennett (hb. Stockholm.); Yorkshire, River Ure near Ripon, 80, Nicholson (hb. Lund.), labelled: P. polygoni- folius PouRR; Shobden March, Herefordshire, 89, Rev:d A. Ley (hb. Ar. Bennett). — Ireland, Lough Corrib, Gahvay, 53, Kirk (hb. Uppsal.): »P. Kirkii Sym^»; Maam Co. Galway, 85, Linton (hb. Stockholm.). — Scotland, a dubious form from Caithness, 86, Marshall (hb. Stockholm.). — A couple of rather dubious plants from Faroe Islands are present in hb. Stockholm. North America. Pine Plains, New York, Hoysradt (hb. Stockholm.), by MoRONG labelled: P. OaJcesianus Robbins. The relationship with P. gramineus and nalans seems rather P. L. x iiodosiis Pom. (P. argutidus Hagstrom, New Potamogetons in Bot. Not., 1908, 106—108. — Cfr. EuG. Simon, Une pi. poitevine nouv. pour la sc. in Bull. Soc. Bot. des Deux-Sevres 1913-14, 37—44.) - Fig. 105. Two froms of this hybrid are present in the Museum at Upsala both of them originating from New England and belonging to the no- dosifolius series of the hybrid, but otherwise a little deviating one from the other. All forms of this hybrid have serrulate submersed leaves a little more durable than those of P. nodosus, and ligules a little longer and Fig. 105. p. argil- moTo deciduous than those of P. gramineus. The latter species mostly tuhis Hagstii. S no- j • i • j. j. j. dosifoiius hagstr. a, predominates in the stem structure. Top of a subm. leaf of the Tuckerman a graminelfolius Hagstr. I. C. a snb'm. leaf of the CwuUs ramosus; foUa raiuca lanceolata sessilia. orongian plant. This var
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