Microbotryum bistortum, M. dianthorum, M. superbum and M. langerheimii, rare species of smut fungi are reported from new localities in Poland, mostly in protected areas. Dianthus superbus subsp. superbus is a new host for M. superbum observed. Taxonomical status of M. carthusianorum and M. superbum is discussed in the paper.
Four records of smut fungi belonging to the genus Microbotryum Lév. are reported. Two species were found on new hosts, namely M. dianthorum on Dianthus borbasii and D. pseudoserotinus and M. superbum on D. stenocalyx. Microbotryum lagerheimii on Lychnis viscaria is a new species for Ukraine.
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