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1 Leaf blades 10-20 dm long and wide; leaf veins anastamosing except near the margins of the ultimate segments; [subgenus Campteria; section Tripedipteris]
....3 Petioles sparsely scaly, especially upwards; petiole scales dark brown to black; pinnae articulate to the rachis, mostly at right angles to it; fertile pinnae (at least) strongly revolute, with little or none of the lower surface exposed
....3 Petioles densely scaly, the scales usually continuing upwards onto the rachis; pinnae not articulate to the rachis, mostly ascending (at an acute angle to the rachis); fertile pinnae with a planar margin, most of the lower surface exposed
......4 Pinnae of mature leaves decurrent in the upper half of the leaf onto the rachis; [subgenus Campteria; section Creticae]
........5 Mature leaves regularly 1-pinnate-pinnatifid to 2-pinnate; [subgenus Campteria; section Campteria]
..........6 Pinnae with broad white central stripe
..........6 Pinnae solid green