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A B D C 5 mm 5 mm 100 µm 10 µm Fig S2 – Infection of Pythium polareisolate CBS118203 (Ex-type) on Sanionia moss (Sanionia uncinata) 5 weeks after inoculation at 5ºC in darkness in an in vitro inoculation test. A brown-colour symptom (arrowheads) developed on stem-leaf tips of S. uncinata infected by the isolate (A). Healthy stem-leaves of the uninfected plant (B). Formation of sporangia of the isolate in and around the discolored tissue of the plant (C and D).