Recent rediscovery of the epiphytic moss Orthotrichum pulchellum Brunt. in Poland
Plášek, Vítězslav, Ochyra, Ryszard, Smoczyk, Michał, Wiaderny, Albert, Koopman, Jacob
Carex × takhtadjanii (Carex diluta × C. distans; Cyperaceae), a new hybrid for the flora of Ukraine
Peregrym, Mykyta, Koopman, Jacob