나도고사리삼속 Ophioglossum LINN.

1. 수피에 붙어서 자라며 잎은 밑으로 처진다    ················································································· 26. 다시마고사리삼

1. 땅에서 자라며 잎은 선다.

2. 포자의 겉은 거칠다 ·············································································································· 27.  나도고사리삼

2. 포자의 겉은 밋밋하다   ········································································································ 28. 좀나도고사리삼