Your S. calcareum 'Sir Wm. Lawrence' is beautiful twit. I think I am falling in love with the calcareum now. I always did love Pink Pearl though from the firs time I saw her. She got about 4½" across. Not sure if she will get bigger than that. I will know next year as I have her in an area where she won't get crowded. Time will tell. I will work very hard at keeping Monstrosum happy and healthy, so we can both have them in our collections.