Haha... you'll get to identify many of them with experience or you begin to recognize what family they are in by there characteristics (google does the rest) or you turn to the knowledgeable folks on forums like this with a picture if you are lucky you can just ask the person who gave it to you. I did update my .txt file on my PC so it is easy to just cut and paste the list...LOLwhoa...how do you keep track of them all wait wait, let me guess you keep a book by it and write them down when you get them,tell me how you remember im quite young 13 and i could not remember all that.
It's good to get into some good habits now as I get older my memory slips a little so I refer to spreadsheets and docs to keep tract of it all like dosing for example. (especially since I was tinkering with it for a while to try to dial it in with my new water source.)
I have two stems in there I have yet add to the list I think one is Myrio and the other I have wait until it transitions to submersed to attempt to identify.