This feature refers to the sliminess or otherwise of the pileus surface.

This feature must be observed on very fresh material in excellent condition. In dry, hot or windy conditions the surface of the pileus will rapidly dry out and any sliminess will disappear. When a viscid or glutinous pileus has dried out, fragments of leaves or litter (or even small invertebrates) can often be seen sticking to the pileus surface; in a dry or moist pileus such fragments are readily blown away or brushed off. Another sign of a viscid or glutinous pileus that has dried out is that the surface may be shiny (as if varnished), although this is not always due to dried slime. If you suspect that the pileus has dried out, look around for fresher fruit-bodies under leaves or litter, or in other more protected microhabitats.

Choose this state if: the surface of the pileus is quite dry or moist but not slimy. If the surface is waxy or buttery (as in Rhodocollybia butyracea), with the surface slippery but not slimy, choose this state.