The proposed Baltic Sea endemic green alga Monostroma balticum represents a foliose morphotype of Ulva intestinalis (Ulvales, Ulvophyceae).
Green algae in Ulva, Monostroma and similar genera are notoriously difficult to identify morphologically, due to high phenotypic plasticity and the presence of cryptic species - which has historically resulted in a challenging taxonomy, poorly resolved species boundaries, and potentially numerous invalid species descriptions. DNA-based specimen identification, especially combined with analysis of…
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