Shaggy manes will grow just about anytime of year if the temps are above freezing and there is adequate moisture. They especially like the sides of roads and any other compacted soil. They generally grow from chunks of woody debris buried during road construction and other "disturbed" soils. They are also found in grassy areas quite often. How'd that spore print turn out? I would imagine the cap would have just turned to an inky puddle on the paper. The wife and I have already started picking Morels here in central Oregon so it's a strange year for us as they're a few weeks early. Those guys up north might have just not been looking for the Shaggy Manes during the spring cause they were focused on the Morels
I used to live in South Bend, Indiana and the Morel season there in the Midwest is a big deal and for good reason. Hope I helped with this info it's great to see other people that are interested in trapping and mushroom hunting like myself.