Dryopteris carthusiana

Usually Dornfarn ( Dryopteris carthusiana )

The Ordinary Dornfarn or Karthäuserfarn ( Dryopteris carthusiana, syn. Dryopteris spinulosa ) is a common member of the genus of worm fern ( Dryopteris ). He has carthusiana the name of the area of the Grande Chartreuse near Grenoble, the center of the Carthusian Order, from where it Dominique Villars has described first.

Description

The overhanging fronds of summer green fern are arranged in rosettes. They reach a length of up to 90 centimeters. The petiole is about as long as the ovate - lanceolate leaf blade and filled with light brown scales. The blade is two to three times pinnate and young yellow-green, later gray-green. The pinnules are sawn mucronate at the edge. The sporangia are sitting in two rows on the bottom of the spore-bearing fronds.

The Ordinary Dornfarn is the broadleaf Dornfarn quite similar, especially when the fronds are young and still without sporangia. The best difference is the scales on the petiole; they are the ordinary Dornfarn only light brown and do not have a dark brown midsection.

The Ordinary Dornfarn has the chromosome number 2n = 164 It is allotetraploid. Two of his genomes derived from Dryopteris intermedia, a North American Art Of what sort come the other two genomes is still unknown. They probably correspond to the two unknown genomes from Dryopteris cristata Kammfarn.

Occurrence

The Ordinary Dornfarn occurs in shady forests, both in oak and pine forests as well as in alder swamps and on the edge of bogs. He loves nutrient-poor, acidic, sandy soils and grows like stumps or at the base of tree trunks, especially in the alder forest. It grows from the level to the subalpine zone. Its area covers Europe and North America, ranging from West Asia and North Asia to Lake Baikal.