KARL GAFF / SCIENCE PHOTO LIBRARY KARL GAFF / SCIENCE PHOTO LIBRARY
Macrophotograph of a liverwort (Marchantia polymorpha) showing a gemma cup with gemmae inside. Gemmae are undifferentiated cells that break off from the plant, allowing it to reproduce asexually. Surrounding the gemma cup is the leafy thallus covered with pores.
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