What does slime mold look like on the grass blades?

Slime mold on grass blades typically presents as a bluish-gray or black substance. This appearance results from the mass of spores and myxamoebae, which are the reproductive structures of the slime mold. When slime molds colonize grass, they often develop a glossy, wet appearance, which can give them the characteristic bluish or dark appearance that resembles a stain on the plant surface.

In contrast, the other options describe different phenotypic changes or issues that may occur on grass but do not accurately represent slime molds. The greenish hue typically refers to algae growth, which can establish in similar moist conditions but appears distinctly different from the blackish substances associated with slime molds. Brown patches are more indicative of turf diseases like brown patch disease, which arise from different pathogens and indicate deterioration of grass health rather than the slimy growth of slime molds. Lastly, white fluffy clusters could refer to various fungal growths, such as powdery mildew, which lacks the characteristic texture and coloration associated with slime molds.