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(a) Planktothrix rubescens group trichome; (b) Dolichospermum macrosporum and its typical acinetes; (c) Aphanizomenon klebahnii tricome and (d) Its typical acinete; (e) Dolichospermum viguieri and its typical position of acinetes and heterocysts. (a), (b) and (e) bar=20 μm; (d) bar=50 μm; (c) bar=100 μm.
