| | [No title] (Site not responding. Last check: 2007-10-09) |
 | | Although the three families of the Marsileales differ widely in morphology, recent studies have indicated that they should be considered a monophyletic grouping. |
 | | Other proposals suggest a relationship between the Marsileales and the Schizeales, or between the Marsileales and the Hymenophyllales. |
 | | However, the evidence is not really strong, athough there is some genetic evidence indicating a possible though ancient alliance with the Schizeales. |
| www.jaknouse.athens.oh.us /ferns/o_mars.html (182 words) |