Lovely liverwort

This is a pore in the epidermis of the liverwort Marchantia. The plant grows along the ground as what's called a thallus, no stems or leaves or roots, and it's divided into photosynthetic sectors with one pore each to allow carbon dioxide in and oxygen out during photosynthesis. Liverworts are very basal plants and the only ones not to have stomata, though all other land plant groups do gas exchange through those instead. I knew about the pores, but I didn't know they were gorgeous! Before I put a cover slip on, the pore stood up like a volcano over the air chamber. - KMP


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