Here I am trying to picture out the difference between A.lunulatum and A.caudatum
This is not a technical discription.
1. A.lunulatum- entirely glabrous, pinnae pale green rarely dark green, pinnules are fan shape or lunar shape or in crescent form and fold down with sori (linear),stipe glabrous long and dark black
2. A.caudatum - hairy, pinnae green ,hairs pale brown and giving a pale brownish color to whole, pinnules not crescent but almost straight fold down with sori but length is very short compared to A.lunulatum, stipe is hairy brownish due to hair color short as compared to lamina.
If the stipe is glabrous ,A.zollingeri but no tail as in A.caudatum