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cephalodium

noun
ceph·​a·​lo·​di·​um | \ ˌsefəˈlōdēəm\
plural cephalodia\ -​ēə \

Definition of cephalodium

: an irregular internal or external gall-like growth in lichens that differs from an isidium in having an algal component other than that natural to the lichen

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History and Etymology for cephalodium

New Latin, from Greek kephalōdēs like a head (from kephal- cephal- + -ōdēs -ode) + New Latin -ium

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