English: Jersey fern.
Clades: Pteridoideae, Pteridaceae.
Genus: 10 species.
Region: worldwide, Mediterranean, southern France, Italy, North America, Jersey.
Habitat: oceanic temperate, subtropical; on walls and banks, on granite rock; on bare soil in moist but well-drained locations; heat-loving, survive the winter by growing in locations where warm water seeps out of crevices.
Ecology: not very competitive; together with Parietaria lusitanica, Selaginella denticulata, Targionia hypophylla, Rhynchostegiella tenella, Timmiella anomala.

BotanyFern; annual; small, ± 8 cm tall.
Leaves: delicate; two-pinnate fronds; inner ones fertile, bearing linear spore cases on the undersides of the nearly circular leaflets, occupying most of their surface area; leaf margins are not curled.
Reproduction: sporophyte tends to have an annual life cycle; gametophytes have the ability to become dormant up to two and a half years until conditions are appropriate for the sporophyte stage of the life-cycle.