Leaves are about 4 cm long and 3 cm large. I took these cuttings in a garden of Marrakech, Morocco last month.
This succulent plant is getting bigger but I still don't know if it's a crassula or something else. Someone's got an idea ? Leaves are now 8 cm (3 inches) long !
Well, this is finally not a crassula. It's a Cotyledon macrantha. See here : http://www.phrygana.eu/Flora/Crassulaceae/Cotyledon-macrantha/Cotyledon-macrantha.html