The cell towards the neck of the archegonium is a mononucleate neck canal cell (mnc) with little cytoplasm (Fig.
When the egg matures, the ventral canal cell is usually detached from the egg at the region of fertilization pore (Fig.
3A, arrow), which is accompanied by the disappearance of the cell wall between the egg and the ventral canal cell seen in previously stage (Fig.
However, a pore region, which is about 2-3 pm, persistently connects the egg and the ventral canal cell (Fig.
The central cell also divides asymmetrically to form a small ventral canal cell (vcc) and a large egg cell, which has most of the cytoplasm (Fig.
The middle of which finally develops into a neck canal cell, a ventral canal cell and an egg by two unequal divisions.
The ventral canal cell participates in the formation of the fertilization pore as suggested in Ceratopteris (Cao et al.
Sections of archegonia clearly demonstrated a short neck, a binucleate neck canal cell and an egg for each archegonium (Fig.
The archegoninm with its short neck, binucleate neck canal cell and egg was known from earlier studies.
The absence of this envelope from the region where the egg and ventral canal cell were formerly interconnected produces a fertilization pore, which is believed to be an entrance for the sperm penetrating the egg.
flabellulatum contains three cells; the egg, the ventral canal cell (VCC), and the neck canal cell (NCC) (Fig.