The proposed Baltic Sea endemic green alga Monostroma balticum represents a foliose morphotype of Ulva intestinalis (Ulvales, Ulvophyceae).
Niko R. Johansson, Jaanika Blomster, Tytti Wärri, Elina Laiho, Elena Schrofner‐Brunner, Nicolas Straube, Cessa Rauch, Sophie Steinhagen
The paper resolves taxonomic uncertainty by showing that Monostroma balticum is a morphotype of Ulva intestinalis using molecular and morphological analysis of historical and contemporary specimens.
bioRxiv · Sep 30, 2026 · PreprintPlant Biology