석위속 Pyrrosia MIRBEL

1. 포자낭군은 주맥 양쪽에 1줄로 배열하며 잎은 너비 5mm 이하이다 ····························································208. 우단일엽

1. 포자낭군은 주맥 양쪽에 여러 줄로 배열하며 잎은 보다 넓다.

2. 잎은 갈라지지 않는다.

3. 잎새와 잎자루의 길이는 각각 4~9cm 이다 ·····················································································209. 애기석위

3. 잎자루와 잎새는 각각 10cm 이상이다 ································································································210. 석위

2. 잎은 3-5 개로 갈라진다 ··············································································································211. 세뿔석위