Wolffiella lingulata

About

Wolffiella lingulata is a species of flowering plant known by the common names tongueshape bogmat and tongueshape mud-midget. It is native to the Americas, where it is widely distributed and grows in calm water bodies such as ponds. It is a tiny plant made up a green frond measuring 3 to 9 millimeters wide. It often takes the form of a mother-daughter pair of fronds as it undergoes vegetative reproduction by budding. It may also undergo sexual reproduction by producing minute, microscopic flowers.

Summary from Wikipedia