Actually, good call Blitz. I thought I'd jump in on this one because I saw the same thing. "Coral anemones, mushroom anemones, or false corals are closely related to true corals, sometimes grouped as part of the same order, Scleractinia, as a suborder. They lack the skeleton of true corals. Often called coral anenomes, they are solitary or colonial, flattened mushroomlike ANEMONES with short, stubby tentacles, radially arranged. Most common genera are Discosoma, Ricordea, Rhodactis, and Corynactis." That's paraphrased but contains the jist of it. Characteristically, you would treat them more as corals than anemones, though. You are probably referring to discosomas or ricordeas, Blitz. If you want to read about it, p. 353 Conscientious Marine Aquarist. (I wasn't about to type the whole thing out.) I think this is like the tomato is a fruit type thing.