†Xanthosia buchii Reuss 1945
Belongs to Xanthosia according to Reuss 1945
Sister taxa: Xanthosia americana, Xanthosia buteonis, Xanthosia danielae, Xanthosia elegans, Xanthosia fischeri, Xanthosia fossa, Xanthosia gibbosa, Xanthosia gracilis, Xanthosia granulosa, Xanthosia occidentalis, Xanthosia robertsi, Xanthosia sakoi, Xanthosia semiornata, Xanthosia similis, Xanthosia socialis, Xanthosia zoquiapensis