Here's the rest of the calypso story. I can't tell it better than Fred Case did in his "Orchids of the Western Great Lakes".
"A distressing situation has developed in Michigan in relation to calypso. So many photographers, all nature lovers, visit known stations in our state parks to observe and photograph the species that the plant colonies have suffered. Not only do the plants get trampled, but competive photographers are reported to destroy especially fine clumps . . . so that no other photographer can picture the same clump."
He goes on to report a similar incident that he observed. So when we see those signs that say, " Take only pictures, leave only footprints", we need to be very careful where we leave the footprints.