Some Observations on the Nucleolus of the Megasporocyte of Lilium

Abstract

The megasporocytes of Lilium constitute excellent material for the study of nucleoli since they are quite large, are not so masked by the chromatin at most stages as are the microsporocytic nucleoli, and the stages are lengthened in time making it easier to get a completely graduated series for study.
Two types of extrusions emerge from the nucleoli. A homogeneous substance is extruded as the megasporocyte begins to elongate and a small globular body is extruded in early prophase I. The latter extrusion occurs concurrently with, or immediately before, a deep invagination is formed in the nucleolus.