Thread pondweed

Thread pondweed
	Filiform pondweed ( Stuckenia filiformis ), illustration
Systematics
Class :	Bedecktsamer (Magnoliopsida)
	Monocots
Order :	Frog-spoon-like (Alismatales)
Family :	Pondweed family (Potamogetonaceae)
Genre :	Stuckenia
Type :	Thread pondweed
Scientific name
	Stuckenia filiformis
	( Pers. ) Börner

The filamentous pondweed ( Stuckenia filiformis ) is a species of the genus Stuckenia within the family of the pondweed plants (Potamogetonaceae). The thread pondweed is a freshwater aquatic plant.

description

Herbarium specimen of Stukenia filiformis subsp. alpinus

The thread pondweed is a perennial herbaceous plant . This underwater plant (submerged plant) has rhizomes rooted in the water bed , which are thin and richly branched. The stem is thin and forked at the base. The floating leaves are submerged, 5 to 20 centimeters long, 0.25 to 1 millimeter wide, almost hair-shaped, gradually narrowing and have a rounded, blunt tip. When young, leaf sheaths are fused in their lower half, 8 to 27 millimeters long and closed at the base.

The 2 to 10 centimeters long and interrupted inflorescence protrudes above the water surface. The stem is 4 to 12 inches long. The fruits are 2.2 to 3 millimeters long and 1.5 to 2 millimeters wide, elliptical, unkeeled and greenish.

The flowering period extends from June to August.

The number of chromosomes is n = approx. 39.

Occurrence

The filamentous pondweed is widespread in the northern hemisphere . But it also occurs on Hispaniola and from Ecuador to southern South America. In Germany it is seldom east of the Elbe (not in Saxony). In contrast, it can be found in the Alps and in the Alpine foothills . It colonizes nutrient-rich lakes and streams up to altitudes of 1,800 meters. In the Allgäu Alps, it rises to an altitude of 1802 meters on the Schrecksee in Bavaria.

It is in the variety Stuckenia filiformis var. Alpina (Blytt) thorn the eponymous species and character species of the Alpine spawn society (Potamogetonetum filiformis) from the association Potamogetenion pectinati. The variety Stuckenia filiformis var. Filifornis occurs more in societies of Ranunculion fluitantis.

Systematics

The first publication took place in 1805 under the name ( Basionym ) Potamogeton filiformis by Christian Hendrik Persoon . The new combination to Stuckenia filiformis (Pers.) Börner was published in 1912 by Carl Julius Bernhard Börner . Some authors also differentiate between varieties or subspecies.

supporting documents

literature

Siegmund Seybold : Flora of Germany and neighboring countries. A book for identifying vascular plants that grow wild and often cultivated . Founded by Otto Schmeil , Jost Fitschen . 93rd completely revised and expanded edition. Quelle & Meyer, Wiebelsheim 2006, ISBN 3-494-01413-2 .

Individual evidence

↑ ^a ^b P. Uotila, 2009: Potamogetonaceae. : Datasheet In: Euro + Med Plantbase - the information resource for Euro-Mediterranean plant diversity .
↑ ^a ^b Potamogeton filiformis Pers., Filiform Laichkraut. In: FloraWeb.de.
↑ Rafaël Govaerts (Ed.): Stuckenia filiformis. In: World Checklist of Selected Plant Families (WCSP) - The Board of Trustees of the Royal Botanic Gardens, Kew . Retrieved June 22, 2018.
↑ Erhard Dörr, Wolfgang Lippert : Flora of the Allgäu and its surroundings. Volume 1, IHW, Eching 2001, ISBN 3-930167-50-6 , p. 124.
↑ Alpine Spawn Society (Potamogetonetum filiformis) .
^ Erich Oberdorfer : Plant-sociological excursion flora for Germany and neighboring areas . With the collaboration of Angelika Schwabe and Theo Müller. 8th, heavily revised and expanded edition. Eugen Ulmer, Stuttgart (Hohenheim) 2001, ISBN 3-8001-3131-5 , pp. 103 .

Web links

Commons : Filiform pondweed ( Stuckenia filiformis ) - Collection of images, videos and audio files

Profile and distribution map for Bavaria . In: Botanical Information Hub of Bavaria .
Potamogeton filiformis Pers. In: Info Flora , the national data and information center for Swiss flora .
Distribution in the northern hemisphere from: Eric Hultén, Magnus Fries: Atlas of North European vascular plants. 1986, ISBN 3-87429-263-0 at Den virtuella floran . (swed.)
Thomas Meyer: Data sheet with identification key and photos at Flora-de: Flora von Deutschland (old name of the website: Flowers in Swabia ).

[Euro+Med-1] P. Uotila, 2009: Potamogetonaceae. : Datasheet In: Euro + Med Plantbase - the information resource for Euro-Mediterranean plant diversity .

[FloraWeb-2] Potamogeton filiformis Pers., Filiform Laichkraut. In: FloraWeb.de.

[WCSP-3] Rafaël Govaerts (Ed.): Stuckenia filiformis. In: World Checklist of Selected Plant Families (WCSP) - The Board of Trustees of the Royal Botanic Gardens, Kew . Retrieved June 22, 2018.

[Dörr-Lippert-4] Erhard Dörr, Wolfgang Lippert : Flora of the Allgäu and its surroundings. Volume 1, IHW, Eching 2001, ISBN 3-930167-50-6 , p. 124.

[Schmitz-5] Alpine Spawn Society (Potamogetonetum filiformis) .

[Oberdorfer2001-6] Erich Oberdorfer : Plant-sociological excursion flora for Germany and neighboring areas . With the collaboration of Angelika Schwabe and Theo Müller. 8th, heavily revised and expanded edition. Eugen Ulmer, Stuttgart (Hohenheim) 2001, ISBN 3-8001-3131-5 , pp. 103 .