쇠고사리속 Arachniodes BL.

1. 잎은 초질 또는 혁질이며 털이 없고 난형 또는 난상 장타원형이다.

2. 잎은 1~4회 우상복엽이며 다소 굳고 위에서 밑을 향하여 포자낭군이 달린다.

3. 잎자루 밑의 인편은 좁은 장타원형 또는 넓은 피침형이고 밝은 갈색이며 윗부분은 실같이 가늘어진 흑색 인편으로 덮여 있다. 잎새는 잎자루보다 보통 길다 ················································································································ 98. 털비늘고사리

3. 잎자루의 인편은 피침형 또는 선형이며 점점 좁아저서 2.5 mm 를 넘지 않는다. 잎새는 잎자루 길이와 같거나 짧다.

4. 근경은 길게 벋으며 잎이 드문드문 돋는다 ···············································································99. 가는쇠고사리

4. 근경은 짧게 벋으며 잎이 배게 돋는다.

5. 포자낭군은 주맥과 가장자리의 중간보다 안쪽에 가깝게 달린다 ····················································· 99+. 좀쇠고사리

5. 포자낭군은 가장자리 가까이 달린다··························································································100. 쇠고사리

2. 잎은 3~4 회 우상으로 깊게 또는 완전히 갈라지고 초질이며 양면의 색깔이 같다. 포자낭군은 밑에서 위로 달린다 ················ 101. 일색고사리

1. 잎은 얇으며 5각형 또는 3각형이다.

6. 잎에 털이 없다. 포막은 다소 굳고 두꺼우며 가장자리는 안으로 굽었다 ··················································102. 진저리고사리

6. 잎은 양변에 곧은 털이 있고 포막은 얇다 ························································································103. 왁살고사리