Marsh telipteris

Family Telipteridaceae. Rare. Widely but discontinuously distributed in North America, Europe, Africa (Algeria) and northern Asia (to Japan in the east and the Himalayas in the south). In Central Siberia it is a rare plant, recorded in Irkutsk Oblast (the village of Yakimovka in Zhigalovsky District and Bratsky District) and in Buryatia. (North-Baikal region: Hakusy Bay on the shore of Baikal, Bolshaya River, Dushelan tract, Lake Irkano).

Rhizome creeping, cord-like. Leaves spaced or clustered, oblong-lanceolate, large (up to 30–60 cm long), twice pinnate. First-order leaf lobes are alternately arranged, lanceolate-linear, almost to the base divided into narrow triangular entire-margined second-order lobes, which on fertile leaves have margins bent downward. Sori are arranged openly and densely on the lower surface of the leaf lobes.

It is of scientific interest due to its discontinuous distribution. In Central Siberia it is a relict of pre-glacial vegetation.