Where to find diagrams of algae species?

Sorry for the dumb question but we have to to draw some algae and write classification a d stuff. I have done the the writing part but cannot find doagrams showing species we are given, most species are local to Pakistani coast but trying to identify them is proving hard without a diagram. Some of the species are Galaxaura rugosa, Gracilaria indica, Udotea indica, Stypopodiun shameeli.