Kalmar "Genus Cetraria" tana nufin rabe-raben kimiyya na lichen. Lichens kwayoyin halitta ne masu hade da ke tasowa daga algae ko cyanobacteria da ke rayuwa a tsakanin filaments na nau'in fungi masu yawa a cikin dangantakar da ke da alaƙa. reindeer lichens" ko "deer mosses." Wadannan lichens ana samun su a Arewacin Hemisphere, musamman a yankunan Arctic da Boreal, inda suke taka muhimmiyar rawa a cikin ilimin halittu na waɗannan yankunan. ya haɗa da sauran nau'ikan lichens da yawa.