What IS this thing....

I have something growing of of my Hygro.  It is white, has a stalk 
going about 1cm high, and at the top there are 4 small threads (for 
lack of better word) branching off in different directions.  It is 
growing on the leaf top.  What is this?  It looks more like an marine 
invert than a freshwater algae or something....
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