Kalmar “genus” tana nufin rarrabuwar kawuna na kwayoyin halitta waɗanda suka haɗa nau’in nau’ikan da suke da kakanni ɗaya kuma suna da halaye iri ɗaya. Aspleniaceae, wanda aka siffanta shi da elongated fronds da spore- bearing structures a ƙarƙashin ganyen.Saboda haka, "genus scolopendrium" yana nufin rarrabuwa taxonomic wanda ya haɗa da nau'ikan ferns iri-iri waɗanda ke raba halaye iri ɗaya tare da su. da scolopendrium fern, kamar su frond siffar da spore- bearing structures.