discosoma sp. is a general scientific name, regardign the genus of the mushrooms. the truth is most mushrooms are not classified, only certain one like ricordea and elephant ear, have a true scientific name. most of all the common mushrooms that we keep in or tanks are unidentified, and the only way to do so would be to genetically profile each of them, its quite possible that they are all the same with color and tentacle morphs, and its also possible that they are all different. but i must say fishlovr, that is a gorgeous set of shrooms, and if you would ever be interested in selling a couple individuals, let me know. they are fantastic!
good luck
jon