Marchantia is the most common of the liverworts, often a greenhouse weed. Liverworts have no true leaves, roots, or stems. They do not have flowers or seeds. The part you see mostly look like a mat of flat "leaves", it is called a thallose.
A closer view of the thallose with gemma cups, mostly empty.
These cups still have gemmae in them.
Water drops falling into a cup will splash the gemmae out.
Each gemma then
grows into a new thallose. This is a form of asexual reproduction.
Here are some female reproductive
structures for sexual
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