I recently found some dead hardwoods in south louisiana with mushrooms growing from them. The mushrooms have decurrent gills, short stems, and grow in a vertical pattern. I started to think i found my first oysters, until i noticed a difference between the larger, thinner mushrooms and the smaller, heartier mushrooms. The biggest difference i notice between the 2 mushrooms is underneath the cap margin. The larger mushroom doesnt have a thick "edge". Its just frayed and fans out with no formal edge underneath. The smaller one almost rolls under and has a rolled edge at the margin. Am i dealing with 2 different types of mushrooms or just oysters in different stages. The first 2 pictures show both. The last 4 pictures show the larger mushroom.