has_part exists_during towards abnormal endoplasmic reticulum morphology excess endoplasmic reticulum membrane present overdeveloped ER membrane increased endoplasmic reticulum membrane proliferation midori excess endoplasmic reticulum membrane present during vegetative growth A physical cellular phenotype observed in the vegetative growth phase of the life cycle in which cells contain more endoplasmic reticulum (ER) membrane than normal. Excess ER membranes may form abnormal structures. 2012-11-21T14:59:30Z endoplasmic reticulum membrane present in greater amount FYPO:0001784 accumulated endoplasmic reticulum membrane excess ER membrane present accumulated ER membrane excess endoplasmic reticulum membrane present during mitotic cell cycle excess intracellular endomembrane system present