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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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



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.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Anderson, "The controversial existence and functional potential of oogonial stem cells," Maturitas, vol.
In the germinal epithelium that lined the ovarian tubules, oogonial proliferation formed clusters of germ cells (nests) that projected into the ovarian lumen (Fig.
In the inter phasic nuclei of female specimens, only one strongly stained nucleolus was observed, confirming the number of active NORs verified in the oogonial metaphases.
Based on ultrastructural observations, the germ cell developmental phases during oogenesis can be classified into 4 phases: (1) oogonial phase; (2) previtellogenic phase; (3) vitellogenic phase and (4) mature phase.
For females, only oogonial prometaphases were studied because no meiotic stages can be detected.
The germ-cell nests, which eventually gave rise to oogonial nests, were first found along the lateral periphery of the lobe and were infrequently scattered within the gonad lobe.
5h, arrow); RVPOs (187-200 [micro]m), and smaller new vitellogenic primary oocytes (NVPOs) (<100 [micro]m), the latter resulting from recent oogonial mitosis (Fig.
Concerning the first question, Pepling & Spradling (1998) have verified a tendency towards the increase in number by the power of two in mouse embryo oogonial mitotic cells, being more frequently found in clusters of two cells.