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Archegonia and antheridia mature at different times

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In mosses, as in liverworts and hornworts, the leafy shoots belong to the gametophytic phase and produce sex organs when they mature. The leafy shoots often called gametophores, because they bear the sex organs arise from a preliminary phase called the protonema , the direct product of spore germination. Filamentous, straplike, or membranous, it grows along the soil surface. A protonema of a moss may proliferate, apparently indefinitely, under favourable conditions and thus increase the population of leafy shoots that arise as buds. Under adverse conditions, certain buds and branches of the protonema may thicken their walls and thus serve to tide the species over an unfavourable growing period.
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About Ferns — American Fern Society

Anthoceros grows on moist soil. They are present in shady places or ;n the crevices of rocks. Anthoceros erecrus, A. Anthoceros has thallus body. It is lobed and it has irregular or dichotomous branches. The lobes have a wavy margin.
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About Ferns

In the female plant there arise at the apex of the stem, surrounded by an envelope of ordinary leaves, several archegonia. They are also positively chemotactic to the watery extract from archegonia. Plants with cellular tissue only; both antheridia and archegonia borne upon the plant itself. In Welwitschia also the megaspore is filled with prothallus-tissue, but single egg-cells take the place of archegonia. The same moisture which caused the antheridia to open also brings about the opening of the archegonia.
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Archegonium , the female reproductive organ in ferns and mosses. An archegonium also occurs in some gymnosperms , e. A flask-shaped structure, it consists of a neck, with one or more layers of cells, and a swollen base—the venter—which contains the egg.
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