Hi annmarie.salem ... like Crutiatix said this is a myxomycota plasmodium... they appear in the most surprising places and might change its shape and colour at any time if it decides to 'fruit'. It's like one giant cell. Here is one similar to yours spreading across a metal roof http://www.flickr.com/photos/gato-ranch/3560705197/
It looks like any type of Myxomycota when its moving and eating anything, but i dont know what it could be eating in cave. Usualy it eats mushrooms or dead trees.
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