I have noticed some short-length hair algae on some plants which looks like the pics of oedogonium. The strands on the glass, however, is strange in that for the strands in the patches I see, the entire strand is stuck to the glass, rather than just one end of a strand. So the effect is a patch of curly threads flattened to the glass rather than a hairy appearance. I've never seen it before... Weird and annoying!
I think the oedogonium species may be different but I think it might be it. It's pretty common in ponds and what not. Actually I think I have it in my outdoor tank ( used to at least).