THis one's been stumping me for awhile. Pictured is the second fruiting of this patch behind my house. Not immediately realizing these were not shaggy parasols, which grow all through the woods on the property, I picked the first flush of two mushrooms THe second flush was also two mushrooms that somebody kicked over before they got open and the third flush (one mushroom) is now in the process of opening. I will supply ongoing photos barring more destruction. THey were on the large side for Shaggy Parasols and after Picking them, I noticed they were also much too heavy and also too firm to be shaggies. I cloned tissue to agar. They grew much better on Malt Extract Agar than true shaggy parasols do. The pictured caps are about the size of a large egg. The veil is similar to parasols, and the gills are off white although they were not yet sporulating. Also, they are very slow to open. The mushroom that's fruiting right now has opened little in the last five days. Temperatures are just above freezing, but nearby shaggy parasols generated a whole new flush during the same five days. The area they are growing is under an (alder? Help! Leaf expert!) tree in a small grassy area next to a sand pile that the (many) cats here used instead of a litter pan. Annoyed by all the cat poo, somebody spread the sand all over the roads in June and then in September the area was disturbed by heavy machinery digging a trench for new hydro service. I mention all this because the area qualifies as both artificially enriched, and also as a disturbed area. Thanks in advance for your help with these ones.