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IMG_0708 Azolla mexicana | by Jon. D. Anderson
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IMG_0708 Azolla mexicana

18 May 2016

 

The red "pond scum" is actually an aquatic fern - Azolla mexicana is a floating plant with blue-green to dark red leaves. It is distinguished from the two other species of the genus present in North America, Azolla caroliniana and Azolla filiculoides, by having multicellular hairs on the leaves and pits on the megaspores.

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Taken on May 18, 2016