Quite large, 30-100 cm tall, fern with infundibular arrangement of leaves with long petioles, with the deltoid or triangular-oval plates. Petioles shorter plates, with lanceolate or oblong-lanceolate, pointed, brown in the middle with a dark stripe membranous scales. Thrice pinnate leaves. Segments of the first order lanceolate, segments of order usually pinnate, often with many films from the bottom and glands, the third-order segments obtuse, apex divaricately-toothed, teeth long, turning into a long soft needles. Spores mature in July and August.
Spread in Europe, except for the southern part of the Caucasus, Siberia, the Far East and North America. In Russia, found everywhere in the forest area, but sporadically.
Grows mainly in coniferous forests, moist soil, often around the peat and peaty soil.
From the rhizome are antivermicular extract.