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 glutinous (very slimy) and the slime forms a relatively thick layer. The slime is so abundant that it may roll over the pileus edge as drops or strands. The slime is often quite reflective. A finger placed on the pileus surface and lifted will readily draw up a strand of slime.

All taxa that are coded as glutinous are also coded as viscid, because as a glutinous pileus dries it can go through a stage when the slime layer thins and appears viscid.