Anybody seen this before? Bluish, somewhat globular fungus along the edge
of the blades, extending from the middle to the top. Touching it releases a
fine black powder. Just a few spots affected so far. Can't google up
anything on this.

Touching it releases a fine black powder.

Then it is most likely a fungus. If you are in the US, contact your county
extension agent. Otherwise, you need to use a fungicide listed for lawns, and
follow he directions on the label.
Iris,
Central NY, Zone 5a, Sunset Zone 40
"If we see light at the end of the tunnel, It's the light of the oncoming
train."
Robert Lowell (1917-1977)

"jml" skrev i en meddelelse
...
Anybody seen this before? Bluish, somewhat globular fungus along the edge
of the blades, extending from the middle to the top. Touching it releases
a
fine black powder. Just a few spots affected so far. Can't google up
anything on this.
It is a species of Entoloma fungi. They don't harm anybody, and you should
not use fungicides.
Poul Evald Hansen