Onoclea sensibilis

Onoclea sensibilis - sensitive fern (bead fern, meadow brake)

West of Alppiruusulaakso (Rhododendron valley), underneath Serbian spruce (Picea omorica) on a damp ditch bed, the sensitive fern attracts us with its cute rounded leaves which is significantly different from native Finnish ferns. The sensitive fern is the sole species of the genus Onoclea. The species name sensibilis means sensitive and refers to its sensitivity to frost: the first autumn frosts turn the fronds black. Though the fronds may be frost sensitive, the rhizomes are not; the sensitive fern has thrived in Mustila for decades.