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From Wikipedia -
Asplenium scolopendrium (syn. Phyllitis scolopendrium, Hart's-tongue Fern) is a fern in the genus Asplenium. The plants are unusual in being ferns with simple, undivided fronds. The leaves are 10-60 cm long and 3-6 cm broad, with sori arranged in rows perpendicular to the rachis. The plants grow on neutral and lime-rich substrates, including moist soil and damp crevices in old walls, most commonly in shaded situations but occasionally in full sun; plants in full sun are usually stunted and yellowish in colour, while those in full shade are dark green and luxuriant. The tongue-shaped leaves have given rise to the common name "Hart's tongue fern"; hart is an old word for deer. The sori pattern is reminiscent of a centipede's legs, and scolopendrium is Latin for "centipede".

Asplenium scolopendrium is a common species in Europe, but in North America occurs as rare, widely scattered populations that have been given varietal status, A. scolopendrium var. americanum. Morphological differences are minor, but the North American populations are tetraploid, whereas those occurring in Europe are diploid. In the United States, A. scolopendrium var. americanum was declared endangered in 1989. The reason that the European variety is relatively widespread, and the American variety a rarity, has apparently not been established. A third variety occurs in southern Mexico and Hispaniola, A. scolopendrium var. lindenii.

A. scolopendrium, with its close relative A. sagittatum, has also been placed in a segregate genus Phyllitis. A. scolopendrium forms hybrids with other Asplenium species, including those species sometimes classified in the separate genus Camptosorus, which is one reason that both Phyllitis and Camptosorus species are now generally included in Asplenium. On the other hand, a recent phylogenetic study of the Aspleniaceae family suggests that A. scolopendrium is only distantly related to other Asplenium species, and that the genus Phyllitis should again be recognized.

Cultivation and uses
Asplenium scolopendrium is often grown as an ornamental plant, with several cultivars selected with varying frond form, including with frilled frond margins, forked fronds and cristate forms. The American variety is reputed to be difficult to cultivate, and most, if not all, cultivated plants are derived from European forms.

This fern was recommended in folk medicine as a spleen tonic and for other uses.

Asplenium scolopendrium (syn. Phyllitis scolopendrium, Hart's-tongue Fern) is a fern in the genus Asplenium. The plants are unusual in being ferns with simple, undivided fronds. The leaves are 10-60 cm long and 3-6 cm broad, with sori arranged in rows perpendicular to the rachis. The plants grow on neutral and lime-rich substrates, including moist soil and damp crevices in old walls, most commonly in shaded situations but occasionally in full sun; plants in full sun are usually stunted and yellowish in colour, while those in full shade are dark green and luxuriant. The tongue-shaped leaves have given rise to the common name "Hart's tongue fern"; hart is an old word for deer. The sori pattern is reminiscent of a centipede's legs, and scolopendrium is Latin for "centipede".

Asplenium scolopendrium is a common species in Europe, but in North America occurs as rare, widely scattered populations that have been given varietal status, A. scolopendrium var. americanum. Morphological differences are minor, but the North American populations are tetraploid, whereas those occurring in Europe are diploid. In the United States, A. scolopendrium var. americanum was declared endangered in 1989. The reason that the European variety is relatively widespread, and the American variety a rarity, has apparently not been established. A third variety occurs in southern Mexico and Hispaniola, A. scolopendrium var. lindenii.

A. scolopendrium, with its close relative A. sagittatum, has also been placed in a segregate genus Phyllitis. A. scolopendrium forms hybrids with other Asplenium species, including those species sometimes classified in the separate genus Camptosorus, which is one reason that both Phyllitis and Camptosorus species are now generally included in Asplenium. On the other hand, a recent phylogenetic study of the Aspleniaceae family suggests that A. scolopendrium is only distantly related to other Asplenium species, and that the genus Phyllitis should again be recognized.