The parenchyma cells beneath the epidermis of the ovule in the micropyle end developed into an archesporial
cell in late April (Fig.
In the nucellus the archesporial
cell without periclinal division formed a primary parietal cell that directly developed into a megaspore mother cell on the later-June (Fig.
The number of chloroplasts is reduced from several in the differentiating archesporial
cells to only a single plastid in each premeiotic sporocyte.
The final division of the archesporial
cells gives rise to daughter cells that depart on different developmental pathways.
cells are recognized by their prominent nuclei and compact cytoplasm.
In Convallaria and Canna the archesporial
cell divides into a proximal megasporocyte and a distal parietal cell, which then repeatedly divides anticlinally to form a single layer of cells between the megasporocyte and the nucellar epidermis.