Foam Harvest Mushrooms

While I have no use for them, if I did, I would use Low Temperature, Hot Glue to mount them to a base. You can fill in the Hot Glue to form a gentle curve between the base material, and the stem, erasing the curve in the stem, locking the mushrooms upright, on their bases.

If you wish to add some texture to the stems, and crowns, you can do so by adding Hot Glue running up the stems, creating striations, as seen in certain breeds of mushrooms. By applying radial arms of Hot Glue to the underside of the crowns, you can create the veined/channeled appearance of some breeds of mushrooms' under-crowns. I would leave some as they are, and others, I would texture, to represent different breeds of mushrooms. The crowns could be built up, to more of a cone shape, as well as other sculpting ideas, using Hot Glue. The hot metal tip is a useful sculpting tool for Hot Glue extruded from the Gun. Cheers!