Archegonium

the female reproductive organ in ferns, mosses, etc.
Historical Examples

The neck of the archegonium is quite long, but does not project above the surface of the prothallium (Fig. 77, H).
Elements of Structural and Systematic Botany Douglas Houghton Campbell

Throughout he compares the structure with the pistillum (archegonium) of Bryophyta.
Makers of British Botany; a collection of biographies by living botanists Various

The archegonium (fig. 1) has the form of a narrow flask with a long neck.
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 Various

Spermatozoids are formed in the antheridium, and these enter the archegonium and fertilize the germ cell.
The Nursery Book Liberty Hyde Bailey

The female organ (archegonium) and the cell which it produces are practically identical in both cases.
How to Know the Ferns S. Leonard Bastin

The fertilized nucleus or germ-cell of the archegonium in Cryptogams, from which the new plant is directly developed.
The Manual of the Botany of the Northern United States Asa Gray

The young sporogonium is protected by a thick calyptra derived from the tissue of the thallus around the archegonium.
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 Various

noun (pl) -nia (-nɪə)
a female sex organ, occurring in mosses, spore-bearing vascular plants, and gymnosperms, that produces a single egg cell in its swollen base
archegonium
(är’kĭ-gō’nē-əm)
Plural archegonia
The egg-producing organ occurring in bryophytes (such as mosses and liverworts), ferns, and most gymnosperms. The archegonium is a multicellular, often flask-shaped structure that contains a single egg. Compare antheridium.