re: Is the some kind of fungus going around?

Two different things. If it’s fungus you’re speaking of, I would suggest that it could be algae from thinning turf. Happens when it’s wet and the turf has thinned out from the winter time.

And if it is a grassy weed at this point in the year, it’s more than likely poa that is producing a seed head and causing issues. Generally, crabgrass is probably just now showing itself in the Dallas area as it is a warm season annual grassy weed. Poa is a cool season annual and while you see it slowly emerge over the winter, the spring like conditions are ideal for growth and reproduction, thus the bajillions of seed heads. Eventually, as it warms up, it will die out. But depending on the weather, I’ve seen it stick around until June sometimes. If it’s rainy and moderately cool in May, it could stick around. If it’s warm and dry it’ll go away quicker. Sometimes verticutting and scalping can help remove it quicker. Although, that should be reserved for a very severe case of poa infestation.