You need to remove the substrate with them. For species on soil or trees use a use a fixed-blade knife to remove them. Those of soil can be protected by adding a mixture of 1/2 water and 1/2 glue to to soil to keep it from breaking apart. On rock, a 3-4 pound hammer and a cold chisel can be used to chip the piece of rock off with the specimen. I cut larger pieces that do not chip well with a rock saw.