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This was not my research project, but one that I did grunt work for as an undergraduate. I never got his results before graduating, but they grow at a rate of ~.5mm per year. This lichen here is about 3cm across. We took measurements of hundreds of round lichens in the area. He made some conclusions based on averages of those numbers. As far as I know, his work is still ongoing!
Yes it was, and road pizza. We didn't hit it though, just found it. The speed limit there was 70 mph. Look at how little damage the outer shell has considering the speed it might have been hit at! Incredible...
Maybe around 4-5" across, pretty big. We found this guy and others on a rig in South Texas, they certainly do wander around there, but they are in remote ranch areas. I've never seen one in our residential area (thankfully!).