Oospore features among morphologically similar and closely related charophyte species: consistency and variability Author Milovanović, Vanja Author Popović, Slađana Author Predojević, Dragana Author Simić, Gordana Subakov Author Ržaničanin, Ana Author Sekulić, Jasmina Šinžar University of Belgrade, Faculty of Biology, Institute of Botany and Botanical Garden “ Jevremovac ”, Takovska 43, 11000 Belgrade (Serbia) itrbojevic @ bio. bg. ac. rs (corresponding author) Author Trbojević, Ivana University of Belgrade, Faculty of Biology, Institute of Botany and Botanical Garden “ Jevremovac ”, Takovska 43, 11000 Belgrade (Serbia) itrbojevic @ bio. bg. ac. rs (corresponding author) text Cryptogamie, Bryologie 2022 2022-11-16 20 12 189 200 http://dx.doi.org/10.5252/cryptogamie-algologie2022v43a12 journal article 10.5252/cryptogamie-algologie2022v43a12 1776-0992 7819451 CHARA BRAUNII Oospores of the Chara braunii analyzed in this study were ellipsoidal in shape and elongated (prolate). Their color was mostly dark brown, to black – from RAL 8016 (mahogany brown) to RAL 8022 (black-brown), rarely RAL 9011 (graphite black) ( Fig. 3D ). The membrane was light brown and granular. A total number of 48 oospores was measured and included in the analysis, 28 from the vicinity of Bela Crkva (pond LO1) and 20 from the SNR Gornje Podunavlje (GPL3). Oospore parameters of Chara braunii in relation to localities where this taxon was recorded are shown in Figure 6 . Analysis described 22% variability in our data, and was significant (F = 1.3, P = 0.002). Variability between populations in remote localities was detectable, and all oospore parameters (except ANI and ISI) correlated with the locality in the vicinity of Bela Crkva (LO1), meaning that the oospores from this locality were distinctively longer and wider, with wider fossa. ISI showed positive correlation only with the locality in SNR Gornje Podunavlje (GPL3), while ANI did not show correlation to any of the sites.