Ruprechtsfarn

from Wikipedia, the free encyclopedia
Ruprechtsfarn
Ruprechtsfarn

Ruprechtsfarn

Systematics
Ferns
Class : True ferns (Polypodiopsida)
Order : Spotted ferns (Polypodiales)
Family : Eyelash family (Woodsiaceae)
Genre : Oak ferns ( Gymnocarpium )
Type : Ruprechtsfarn
Scientific name
Gymnocarpium robertianum
( Hoffm. ) Newman
Illustration from "The ferns of Great Britain and Ireland"

The Gymnocarpium Robertianum ( Gymnocarpium robertianum ) is a fern - Art , which in Central Europe, especially in the limestone areas of the Alps is widespread.

description

They are perennial ferns with a long creeping rhizome . The fronds are more or less solitary to slightly tufted.

The fronds are 10 cm to 40 cm long (with stem), but usually between 20 cm and 30 cm. In contrast to the beech fern, the 1-2 mm thick frond stem is less than twice as long as the triangular frond blade. The petiole and blade are hairy on the underside with short glands.

The fronds are double-pinnate, except for the lowest pair of plumage, where they are triple-pinnate. The lowest leaflets are clearly larger than the other leaflets, but in contrast to the beech fern, they are smaller than the rest of the frond blade. In contrast to the arctic Gymnocarpium jessoense , the basal plumage of the lowest plumage pointing towards the tip of the frond is significantly narrower than the opposite plumage pointing towards the base of the leaf.

The species chromosome number is 2n = 160-168.

Distribution and location requirements

The Ruprechts fern grows in chalk rock cracks, on rubble and on the floor of rubble forests, sometimes on walls with calcareous rock. He is a Thlaspietalia order character. It often occurs in the pre-alpine Gymnocarpietum robertianae or in the alpine Moehringio-Gymnocarpietum.

It is widespread in the limestone regions of the Alps , outside the mountains it occurs only sparsely or rarely in Central Europe . It occurs in Europe and western Asia to the Caucasus , as well as in eastern Canada and some north-eastern states of the USA as well as in Algeria .

Sources and further information

literature

  • Henning Haeupler , Thomas Muer: picture atlas of the fern and flowering plants of Germany (= the fern and flowering plants of Germany. Volume 2). Published by the Federal Agency for Nature Conservation. Ulmer, Stuttgart 2000, ISBN 3-8001-3364-4 .
  • Werner Rothmaler : Excursion flora for the areas of the GDR and the FRG . Volume 2: Vascular Plants, 14th Edition. People and knowledge, Berlin 1988, ISBN 3-060-12539-2
  • Wolfgang Frey , Jan-Peter Frahm , Eberhard Fischer, Wolfram Lobin: Small cryptogam flora Volume IV: The moss and fern plants of Europe. Gustav Fischer Verlag, Stuttgart, Jena, New York 1995, ISBN 3-437-30756-8

Individual evidence

  1. ↑ a b Erich Oberdorfer : Plant-sociological excursion flora for Germany and neighboring areas . 8th edition. Stuttgart, Verlag Eugen Ulmer, 2001. Page 82. ISBN 3-8001-3131-5
  2. ↑ Kathleen M. Pryer: Gymnocarpium Newman . In: Flora of North America, vol. 2. [1] .
  3. ↑ M. Christenhusz & E. von Raab-Straube (2013): Polypodiopsida. Datasheet Gymnocarpium In: Euro + Med Plantbase - the information resource for Euro-Mediterranean plant diversity.

Web links

Commons : Gymnocarpium robertianum  - album with pictures, videos and audio files