We literally stumbled over (but not quite in) this little pond – the water being barely visible because of the almost solid cover of duckweed.
Oh, there IS water under the layer of green.
The Orbis pond is in the woods above the town of Zwingenberg.
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pictures imperfect blog 
There’s a lake in California- oddly enough called Clearlake- that has this algae all over its surface. It is interesting to look at- but it kind of gives me the ick too.
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