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The unisexual female sex organ in oogamous algae and fungi.
A descendant of a primary germ cell which develops into an oocyte.



the female sex organ (gametangium) of many lower plants that are characterized by oogamy. A single egg cell develops in the oogonium. Several egg cells rarely develop, for example, in Cyclosporeae brown algae. The oogonium is usually unicellular; less frequently, is it multicellular, for example, in Charophyta algae.

References in periodicals archive ?
Within the same individual, alongside mature male gametes, female oogonia also develop (Coe 1931b).
Because of the plasticity of their gonad development, striped mullet retain some characteristics of the opposite sex (such as singular oogonia in males or duct-work in females) during the initial stages of differentiation.
Stage 1 oocytes appeared more oval shaped than the oogonia but were still closely adhered to the trabeculae, and ranged from 20-25 [micro]m in size (Fig.
We saw no primary oogonia in our histological sections of mature ovaries, another indication that new oocytes are not produced in mature ovaries.
vulgaris reynaudii 4 types of oocytes: (1) oogonia, (2) oocytes with follicle cells that change from squamous to cuboidal, (3) oocytes surrounded by follicular cells, (4) follicular oocyte folds displaced to the periphery by the formation of the yolk, and (5) mature oocytes without follicle cells.
Spermatogonia or oogonia cannot be identified during this phase and, consequently, the sexes cannot be differentiated.
50) Gonad stage Microscopic criteria 1 Immature Oogonia and primary growth oocytes present; high proportion of connective tissue, no atresia or MAs, ovarian membrane thinner than in resting stage.
Oogonia cells are growing from the trabeculae and form clusters on trabecular walls.
Active Follicles are filled with Follicles start to grow development oogonia and developing and enlarge, and oocytes anchored to the connective tissue follicle wall, and reduces.