. Critical researches on the potamogetons. KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 55. N:0 5. 119 "-str .ep The few ripe fruits seen are in form and size like small fruits of the last mentioned species. The peduncles are 15—25 mm long. The colour of the plant is at first dark-green, as in P. trich., but turns finally into brown (P. obtusif.). Beside the colour and apexes of the leaves, their strong mechanical strands stand decidedly up for P. trichoides as the one of the parents of this hybrid. The plant described above is gathered by Foucaud in France, Charente-In- ferieure, Marais d
. Critical researches on the potamogetons. KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 55. N:0 5. 119 "-str .ep The few ripe fruits seen are in form and size like small fruits of the last mentioned species. The peduncles are 15—25 mm long. The colour of the plant is at first dark-green, as in P. trich., but turns finally into brown (P. obtusif.). Beside the colour and apexes of the leaves, their strong mechanical strands stand decidedly up for P. trichoides as the one of the parents of this hybrid. The plant described above is gathered by Foucaud in France, Charente-In- ferieure, Marais du Four-du-Diable pres Echillais, 52 (hb. Stockholm.) and in the same station in 1890 by Jotjssbt and Foucaud (hb. Lund.). By French authors considered to be P. Berchtoldi Fieb. A plant from Hercecjovina, Buna-river, gathered ("/' 1889) by Prof. S. Murbeck (hb. Stockholm., Uppsal., Lund.) is also the same hybrid. It lacks turios but all its properties are intermediate between the two above written species. The affinity with P. trich. is especially evident anatomically as well as morphologically. From this firm starting point the other partner can easily be traced in the leaves and ligules. No other stations for this bastard are known to me. — P. obtusifolius is said to occur in The Himalayas (ex Bennett, in Graebner, Pot. 1907, 161). 1 have seen the specimens here concerned, collected by D:r Brandis, 1864, n:r 3333 and now preserved in Calcutta, India. This plant, standing very close to the new American species below, and perhaps only a broad-leaved variety of this, certainly has the habit of P. obtusifolius, to which can be added that the size and form of the leaves also correspond pretty closely to that species, but their nervation and inner structure is quite different. The leaves are about 2 mm broad and 3-nerved, the lateral nerves join the midrib a leaf-width beneath the point and the midrib is accompanied up to the very apex by a richly developed lacunar system,
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