A very popular form of S. calcareum with pale green leaf bases and sharp, dark red-brown tips. It makes a good specimen in a clay pan and is frequently seen on the show benches. It's a good garden plant too.
Pictured here growing on our Semp' wall - one rosette pressed into a handful of soil between the stones, probably about 15 years ago. It is just about out-competing the moss and lichen!