phellogen

noun
phel·​lo·​gen | \ˈfe-lə-jən \

Definition of phellogen 

: a secondary meristem that initiates phellem and phelloderm in the periderm of a stem or root

called also cork cambium

First Known Use of phellogen

1875, in the meaning defined above

History and Etymology for phellogen

Greek phellos + International Scientific Vocabulary -gen

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The first known use of phellogen was in 1875

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