Table 4 Taxonomical listing for the charophytes mentioned in this study (cf. Fig. 9), according to the reference classification (Feist et al. 2005) and previous data (Berger 1983, 1992; Charollais et al. 2007; Weidmann et al. 2014). Only the most relevant references are reported in the bibliography, for the others see Feist et al. (2005).