Theres a link for the video here. This is what ive learned so far… It could be a few things such as gametangia. In Subwassertang, the gametangia (archegonia for female and antheridia for male) could show as specialized reproductive structures involved in sexual reproduction. The circular structures could be archegonia or antheridia, with the stalk-like extensions being part of the reproductive process.
Theres also the gemmae in which would be asexual reproductive structures that liverworts produce, but these are not loveworts. Gemmae are small, multicellular bodies that can develop into a new plant. The circular structures with stalks could potentially be gemmae cups or other forms of reproductive bodies…
by forumail101
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https://youtu.be/O8lWMbWXCQc?feature=shared