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1 Archegonium with egg cell
2 cells of prothallium
English name: non-descript
Scientific name: non-descript
Upperview of the archegonia on a prothallium of a fern. Each archegonium produces a single egg cell. The upper and lower picture show the same archegonia but at a different focus level. After fertilization of the egg cell the zygotes gives rise to an embryo that at the beginning of its development depends on the gametophyt for nutrient supply.