verified source for familyFaria, R. S.; Ricardi-Branco, F. (2009). Leonardosia langei Sommer (Charophyta, Porocharaceae) from Corumbataí Formation (Guadalupian), Piracicaba, SP, Brazil: first record of an antheridium and of corticated thalli. <em>Ameghiniana.</em> 46: 49-57., available online athttp://www.ameghiniana.org.ar/index.php/ameghiniana/article/view/176/33[details]