Weird grass (turf that is)

I put in a fescue lawn about 10 years ago, and have noticed an odd grass growing in my lawn in small patches over the years. I have noticed the same odd grass in neighbors yards as well. This particular strain has very thin blades, sort of like dog hair, or maybe like thin pine needles. It is fairly dark green in color, and grows very dense at the base. Walking on it is like walking on zoysia, very dense and carpet like compared to the rest of the lawn. I don't think it's a zoysia because it doesn't brown out at the first frost, and maintains it's color like the rest of the lawn does through the winter. (Connecticut). I use the standard lawn applications such as pre-emergent and weed killers, which has no effect on it. Other than my yard and those of the neighbors, I've never seen anything remotely like it. Any ideas?
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