| PT | a heavy precious metallic element |
|---|---|
| PT | a small fast unarmored and lightly armed torpedo boat |
| PT | a major god |
| PT | large arctic and subarctic grouse with feathered feet and usually white winter plumage |
| PT | small genus sometimes included in genus Onoclea |
| PT | tall fern of northern temperate regions having graceful arched fronds and sporophylls resembling ostrich plumes |
| PT | one of a number of families into which the family Polypodiaceae has been subdivided in some classification systems |
| PT | a genus of ferns belonging to the family Dennstaedtiaceae |
| PT | large coarse fern often several feet high |
| PT | fern of southeastern Asia |
| PT | containing all the vascular plants that do not bear seeds: ferns, horsetails, club mosses, and whisk ferns |
| PT | plants having vascular tissue and reproducing by spores |