. Critical researches on the potamogetons. KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 55. N:0 5. 157 21-nervia, 90 X 30 mm, sub spica prim. 100 X 25, 19-nerv. Ligulm 40—50 mm longae, bicarinatse, badise, membranaceae, in spatio intercarinali 15-nervia3. Pedunculus prima- rius ca. 90 mm 1., crassiusculus. Spica deflorata ca. 40 mm. longa. Folia perianthii longe unguiculata. Pistillum breviter stylatum, stigmate oblongo. Fructus 3,2 X 2,5, ± carinatus, rostro brevi apicali v. subapicali, operculo rotundato. Anatomy of the stem: epidermis-cells about ten times as long as broad, two- layered pseu
. Critical researches on the potamogetons. KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 55. N:0 5. 157 21-nervia, 90 X 30 mm, sub spica prim. 100 X 25, 19-nerv. Ligulm 40—50 mm longae, bicarinatse, badise, membranaceae, in spatio intercarinali 15-nervia3. Pedunculus prima- rius ca. 90 mm 1., crassiusculus. Spica deflorata ca. 40 mm. longa. Folia perianthii longe unguiculata. Pistillum breviter stylatum, stigmate oblongo. Fructus 3,2 X 2,5, ± carinatus, rostro brevi apicali v. subapicali, operculo rotundato. Anatomy of the stem: epidermis-cells about ten times as long as broad, two- layered pseudo-hypoderma, no subepidermal or ligular bundles, 0-endodermis, central cylinder prototypic (see p. 162). The specimens examined are labelled: Uruguay, Paso Zapeyii, 01, Berro (hb. Haun.). P. meiiibraiiaceus n. sp. — Fig. 75. Caulis teres simplex ut videtur, ramo primes ordinis prolongatus, internodiis elongatis, sub spica primaria ca. 12 cm. longis. Folia omnia membra- nacea, lanceolata, apice brevissime et obtuse mucro- nulata, basi lanceolata vel ovali-lanceolata, 55—65 X 13—15 mm, integerrima, 13 —15-nervia, nervo medio reticulata, petiolata, petiolo 8 — 20 mm longo angusto. Ligulce membranacese cadiicse fere ecos- tatse, 25—30 mm longse in superiore parte caulis. Pedunculus sequalis, ± 10 cm longus. Spica florens 15 mm longa densa. Pollen globosum parvum. Pistillum breviter stylatum, stigmate parvo ovali instruct am. The species described above is by Mr. Ar. Bennett in Dr. Tiselii herbarium (now in hb. Stockh.) united with his P. Cheesemanii. The latter species, however, being characterized by a rich production of floating leaves, can scarcely be united with P. membranaceus, in which no trace at all of such leaves can be observed. Besides, the leaves are short-petioled and provided with an obtuse little cusp, certainly very short but distinct. Further they are broader and with more nerves than the submersed leaves of P. Cheesemanii. swollen. Fruit not seen.
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Keywords: ., bookcentury1900, bookcollectionbiod, bookdecade1910, bookyear1916
