Chara globularis, Thuil., C.

Milovanović, Vanja, Popović, Slađana, Predojević, Dragana, Simić, Gordana Subakov, Ržaničanin, Ana, Sekulić, Jasmina Šinžar & Trbojević, Ivana, 2022, Oospore features among morphologically similar and closely related charophyte species: consistency and variability, Cryptogamie, Algologie 20 (12), pp. 189-200 : 193

CHARA GLOBULARIS

Oospores of Chara globularis analyzed in this study were on average prolate (elongated) and ellipsoidal. The color varied from dark brown to black – from approximately RAL 8022 (black-brown), through RAL 9004 (signal black) to RAL 9005 (jet black) ( Fig. 3A ). The membrane of the oospore was brownish and slightly granular. A total number of 94 oospores was measured and included in the analysis – 54 from the vicinity of Bela Crkva (DP and SL) and 40 from the SNR Gornje Podunavlje (GPL1).

Oospore parameters of Chara globularis in relation to localities where this species was found are shown in Figure 4 . The analysis (F = 2.1, P = 0.002) described 32% variability in our data. The sampling localities are clearly separated, as can be seen on the ordination diagram. Oospore parameters of Chara globularis are clearly negatively correlated with GPL1 and oriented toward the left side of the ordination diagram showing a positive correlation with DP and SL localities. More precisely, higher values of the width of the fossa, (ISI and LPA) were related to SL, while higher values of LED, ANI, number of ridges and AND were connected to the DP locality. Multivariate analysis clearly highlighted intraspecific (i.e., interpopulation) variability of C. globularis oospore parameters, pointing out that all parameters had higher values in specimens found in vicinity of Bela Crkva (SL and DP) in comparison to the remote locality in SNR Gornje Podunavlje (GPL1). The variability of measured parameters was clearly visible even between populations from geographically close localities (SL and DP).

Figures

FIG. 3. — Oospores of selected charophyte species:A, Chara globularis Thuil.; B, Chara “connivens” P.Salzmann ex A.Braun;C, Chara baueri A.Braun;D, Chara braunii C.C.Gmel. Scale bars: 200 µm.

FIG. 4. — Oospore parameters of Chara globularis Thuil. in relation to localities where this species was found. Redundancy analysis (RDA). Abbreviations: see Material and methods.