| Answer | Crossword Clue |
|---|---|
| pteridology | The study of ferns and related plants |
| prothalloid | relating to the prothallus, the gametophyte or sexual generation in ferns and related plants |
| prothallus | The gametophyte of ferns and other primitive plants |
| prothalli | The gametophyte of ferns and other primitive plants |
| pteridophytes | A member of the Pteridphyta, a division of plants including the ferns and their allies (horsetails, club mosses) |
| pteridophyte | A member of the Pteridphyta, a division of plants including the ferns and their allies (horsetails, club mosses) |
