Jody B wrote:
I seem to remember that healthy lawns lean more toward bacterial and less toward fungal. The fungus is a sign that there is an excess of carbon that it is trying to break down. This can be found in wood chips,thatch, and wet soils help it along. I would try aerating to break up the thatch layer and allow for better drainage. Only do this when temperatures are below 80 degrees and above freezing as to not expose grass roots to harsh conditions.
Fertilizing in some way may help as well.