| Antheridia formed on the dorsal and ventral surfaces of the wing, while archegonia formed on the ventral surface of the anterior cushion. |
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| The grain is empty because the body cell and prothallial nuclei have moved out along the pollen tube towards the archegonia. |
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| Since the asexual gametophyte does not form antheridia or archegonia, crosses to confirm its genotype could not be performed. |
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| Notwithstanding their general similarity, the archegonia of mosses differ externally from antheridia in having a longer neck and longer stalk. |
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| This is a new feature and contrasts with most free-sporing plants in which sperm, rather than the whole microgametophyte, move to the archegonia. |
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| Numerous antherozoids are produced in the antheridia and they swim through the covering film of water to reach the archegonia, each of which contains a single egg cell. |
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| Each gametophyte was also scored for the number of antheridia and archegonia present. |
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| After 8 to 9 weeks, archegonia had developed on the lower surface of the gametophytes just behind the growing apex. |
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| The female gametophytes grow to produce two or more archegonia, each of which contains an egg. |
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| Sperm are flagellated and must swim from the antheridia that produce them to archegonia which may be on a different plant. |
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| Fertilized eggs become zygotes, which develop into sporophyte embryos inside the archegonia. |
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| The exact arrangement of the antheridia and archegonia in monoicous plants varies. |
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| Gametophytes first produced antheridia and archegonia after seven weeks of culture. |
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| Second, these gametophytes produced archegoniophores that elevated archegonia above the substrate. |
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| Specimens were thick sectioned for the presence of the archegonia and thin-sectioned with a diamond knife on an Ultracut-E ultramicrotome. |
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| Archegonia are distributed on the lower surface of the gametophyte at the apical end of cushion and near the meristematic region. |
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| Microscopic observations made it possible to verify the integrity and the proper development of the prothallia, and the presence of archegonia and antheridia. |
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| The main division is between species in which the antheridia and archegonia occur on the same plant and those in which they occur on different plants. |
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| The term monoicous may be used where antheridia and archegonia occur on the same gametophyte and the term dioicous where they occur on different gametophytes. |
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| Archegonia are surrounded early in their development by the juvenile perianth, through the slender beak of which the elongated neck of the fertilized archegonium protrudes. |
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