Interesting record of the representative of genus Stigonema S. Agardh ex Bornet et Flahault (Stigonemataceae, Nostocales, Cyanobacteria) in the Podilsky Tovtry National Nature Park (Khmelnytsky Region, Ukraine) - O. M. Vynohradova; S. O. Nyporko; M. S. Kozyr (Algology, 2023)