Garden Pests and Diseases: Fungus? Insect damage? Something else?, 1 by Loligo

Loligo wrote:
Cross-posted from the Daylily Forum, where we don't have a solid answer yet....

There's this white stuff that's been growing on two of my newly acquired daylilies for several days now. It started out as a thin white net-like pattern on the leaf surface. In some parts that has increased to a thick, cream-colored goop that hardens to a yellowish crust (especially on the leaf edges and the underside of the leaf midrib). The ground beneath each affected leaf is also stippled with tiny white dots, which do not appear anywhere else in the flower bed. There is some erosion along the edges of the affected leaves, but I don't know if that preceded the white stuff, or followed it.

I can't get my camera to take a focused picture of the dots on the soil, but I did get one decent shot of the white netting pattern and some of the thicker goo.

Any ideas? Some people suggested slug trails, but if so, these are like no slugs I've ever seen in my garden before....