Depends on the species but generally in the range of low tens of µm to several hundred µm, so you need to photograph them with a compound microscope fitted with objectives in the 10x-60x magnification range. I've been putting some algal images up in the other cryptogam category http://canberra.naturemapr.org/Community/Categories/Details/105 I will place a scale on the next lot of images I submit.
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