LAUSR

molecular data (16S rRNA gene) with new findings (average nucleotide identity, secondary structure of ITS rRNA). These data clearly show the close evolutionary history of U. natans and Chrysosporum ovalisporum , but not Ch. bergii . Most surprising is that numerous experiments with growth deficiencies in the strains studied (phosphorus, vitamins, salinity) showed unexpected effects. For example, vitamin deficiency leads to the formation of true branches in U. natans but also, unexpectedly, in Ch. ovalisporum (Figure 1a,b). This allowed, in agreement with molecular data, these two species to be declared as representatives of the genus Umezakia with the species U. natans and U. ovalisporum . This work provides a beautiful example that modern taxonomy should be done truly as a polyphasic approach (Komárek, 2016) and not just with the almost isolated use of molecular methods, as is often the way. Such comprehensively designed studies then provide clear answers and not just chaos, as sometimes ap-pears from somewhat one- sided studies.