Kalmar "genus" tana nufin nau'in harajin da ake amfani da shi a cikin ilimin halitta don rarrabawa da rukuni na kwayoyin halitta masu irin wannan halaye. ferns. Waɗannan ferns an san su da ƙaƙƙarfan ɓangarorin ɓangarorin su na fan kuma ana samun su a wurare daban-daban a duniya. Saboda haka, "genus Adiantum" yana nufin rukunin ferns waɗanda ke cikin jinsin Adiantum.
