Cryptogramma crispa

Krauser Rollfarn ( Cryptogramma crispa )

The Krause Rollfarn ( Cryptogramma crispa (L.) R.Br. ex Richardson, . Syn. Allosorus crispus (L.) Bernh ) is a species of the genus of ferns Roll ( Cryptogramma ) and thus the family of Saumfarngewächse ( Pteridaceae ).

Description

The plant is perennial and is 15-30 cm high. It has a branching rhizome. Their leaves are in a dense clump, they are summer- green, feathery soft and three - to fourfold. They are 15-30 cm long. The petiole is as long as the leaf blade equal to twice. The Fiederabschnitte are often crowded, narrow ovate and are usually at the bottom thickness taper. The leaves with spores are slightly different than the sterile and are about 35 cm long. Here the Fiederabschnitte are 2-10 mm long and 1-2 mm wide and rolled on the edge. The sori are initially covered by the leaf edge, and later open and naked ( schleierlos ).

The spores are ripe in June to September. The chromosome number is 2n = 120

Occurrence

The Krause Rollfarn grows like in scree slopes and scree, also on rocks, mostly on calcium-poor subsoil. It comes in Central Europe, especially in the high montane to alpine levels of the Alps and rarely rises ( in the low mountain ranges ) below 1000 m down. It is a characteristic species of Cryptogrammetum. In Germany he has deposits in the Black Forest, in the Bavarian Forest and the High Fens; earlier he also happened in the resin. The area of the species ranges from northern Europe and the mountains of southern Europe to the Caucasus. In Central and East Asia and in North America closely related species occur.