1	Stipe and rachis red-brown; pinnules asymmetrical.		1 R. mesosorus
+	Upper part of stipe and rachis stramineous; pinnules symmetrical or ?symmetrical		(2)
2 (1)	Pinnules and pinnule lobes contiguous or approximate, lobes truncate, entire or shallowly crenate.		2 R. truncatus
+	Pinnules and pinnule lobes (particularly basal ones) apart, lobes orbicular, crenate		(3)
3 (2)	Pinnule lobes and secondary pinnules usually oblong, rarely ovate.		3 R. consimilis
+	Pinnule lobes and secondary pinnules ovate		(4)
4 (3)	Basal pinnae wider than upper ones, narrowly ovate, relative length to width ca. 2:1, surface of spores with few irregular, broadly flakelike folds.		4 R. blotianus
+	Basal pinnae similar to upper ones, broadly lanceolate, relative length to width ca. 3:1, surface of spores with sparse irregular flakelike and filiform protuberances.		5 R. pulcher