Kalmar "Cystopteris" tana nufin jinsin ferns na dangin Cystopteridaceae. Sunan kimiyya ne da ake amfani da shi don gano rukuni na nau'in fern. "Cystopteris" ya samo asali ne daga kalmomin Helenanci "kystis," ma'ana "bladder," da "pteron," ma'ana "fern." yawanci ana samun su a yankuna masu zafi. Waɗannan ƙwanƙolin suna da ƙayyadaddun ƙayatattun kusoshi masu rarrabu kuma an fi sani da ferns na mafitsara ko ferns masu rauni. Suna yawanci girma a cikin wuraren zama masu ɗanɗano kamar ciyayi, gangaren dutse, ko kusa da bankunan rafi. an rarraba shi cikin wannan takamaiman nau'in haraji.