The lamellae (gills) get this almost crimped look at times when they dry out and age. Yes, there was another Macrolepiota clelandii that I've seen today. These are saprotrophic (decomposers) fungi that are cycling essential nutrients back into the soil for plants to use. That's a great image of the ring (annulus) on the stipe. This is the remains of the partial veil that extended from the stipe to the edge of the cap to protect the lamellae in the immature fungus. The image also clearly shows the attachment of the lamellae to the stipe. Good image.