(sensu Fægri, 1956) The inner part of the exine which remains relatively unstained with basic fuchsin in optical microscopy and has a lower electron density in conventionally prepared TEM sections. Synonym of nexine 2 ( Erdtman, 1960b). Comment: Originally endexine was defined simply as the inner of the two main layers of the exine ( Erdtman, 1943) to which Erdtman later applied the term nexine. However, as more recently defined, endexine does not include the foot layer ( nexine 1) which is considered part of the ectexine. See also: ectexine.