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Zasmidium subsanguineum on Maianthemum bifolium (LBL, Łęka Reserve near Zaklików, 10 July 1996, leg. J. RomaszewskaSałata). A. Leaf spots. B. Conidiophores. C. Conidia. Scale bars: A = 20 mm; B, C = 20 μm. U. Świderska-Burek del. Notes:-The fungus has been noted on M. bifolium (from Europe, Asia, and North America), M. canadense Desf. (from North America), M. dilatatum (Alph. Wood) A. Nelson & J.F. Macbr. (from North America and Asia), and M. racemosum subsp. amplexicaule (Nutt.) LaFrankie (Braun 1998, Braun et al. 2014, Crous & Braun 2003, Farr & Rossman 2020). In Poland, the species is recorded quite frequently. Additionally, another cercosporoid fungus, Cercospora maianthemi Fuckel, has been noted on Maianthemum. It differs in much longer and wider conidiophores (up to 175 µm long and 7.5 µm wide) and conidia (up to 150 µm long and 8 µm wide), which are also multiseptate (2-22-septate) (Braun et al. 2014, Chupp 1954, Świderska-Burek 2015).
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Two Zasmidium plant pathogens (Z. lythri and Z. subsanguineum) from different localities in Poland have been revised taxonomically based on herbarium specimens and on fresh collections. They are described and illustrated, and their distribution from the literature data in Poland and worldwide is compiled.
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