The Genus is Haliptilon. You can see it when you go diving in Hawai'i and the Virgin Islands. Not too hard to keep, but it does use up more Calcium and Iron than most macroalgae. If your Calcium and Iodine levels are good, this will grow well, encrusting live rock as it goes. A very nice macroalgae, it tastes bad, so most tangs and foxface leave it alone.