The article by Natalia Olejnik, Zbigniew Celka and Piotr Szkudlarz (Department of Plant Taxonomy) and Myroslava V. Shevera (M. G. Kholodny Institute of Botany, NAS of Ukraine) was published in “Review of Paleobotany and Palynology”. The article focuses on the taxonomical importance of morphological traits of spores in the family Ophioglossaceae (Psilotopsida).
https://www.sciencedirect.com/science/article/pii/S0034666717302075