Maybe it happened to ask yourself what would be the smallest/tiniest Fissidens. Well here one of these nano mosses - Fissidens pussilus his name. and because i always been asked about commercial names, you can call it Fissidens TOBI. living on rocks in full shade, and being only 1-2 mm high, i would say usually it is only about 1mm. Enjoy, and have a nice weekend, friends!