|| Lobes oblique, slightly falcate, almost near to the costa, 3-4 mm apart
|| Lobes acute, acuminate, oblique, almost to the costa or half way to the costa
|| Lobes acuminate, one fourth towards the costa, slightly oblique apex with short stiff point
|| Lobes other than acuminate, more or less half way one- fourth way to the costa, apex other than pointed
|| Lobes a little half way to the costa, lobes rounded to broadly pointed, costules 4.0-4.5 mm apart
|| Lobes nearly or more than half way to the costa, costules more or less than 4.0-5 mm apart
|| Pinnae base caudate-acuminate, lobed to 15 mm from the costa, lobes oblique, slightly falcate in the larger pinnae, entire or largest ones crenate, costules 3.0-3.5 mm apart.
|| Pinnae base auricled or not, lobed with forked veins, lobes more than half way to the costa, lobes slightly oblique, ends rounded, costules commonly 4 mm apart.
|| Pinnae base strongly auricled lobed with forked veins, lobes more than half way to the costa, lobes slightly oblique, ends rounded, costules commonly 4 mm apart.
|| Largest pinnae auricled or not, lobes about one-fourth to the costa, veins prominent or not, forked or not
|| Largest pinne not auricled, acuminate lobed, about one-fourth towards the costa, lobes slightly falcate, rounded but with a very short forward pointing tip
|| Lobed accuminate, apiculate, with different length of depth from the edge, ligulate.
|| Lobes accuminate to a depth 2.5-3.0 from the edge, lobes distinctly apiculate, costules 5 mm apart, slightly ligulate.
|| Pinnae edges entire, cuneate, lobes entire, crenulate, veins free, anastomosing
|| Pinnae, edges cuneate to depth of 1mm lobes sometimes with a distinct apiculus. veins 4 pairs, 1-2 anastomosing
|| Pinnae lobes less than half way to the costa, veins anastomosing with zigzag excurrent vein and half to one pair short sinus membrane.