The FernsFilicales |
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3:1 | Polypodium fertile leaflet. | |
3:2 | Cyathea divergens dictyostele. | |
3:3 | Botryopteris petiole trace in transverse section. | |
3:4 | Tempskya stem in transverse section. | |
3:5 | Tempskya stem in transverse section; close-up of roots and stems. | |
3:6 | Cyathodendron permieralized stem. | |
3:7 | Cyathea caracasana, a tree fern from Colombia. | |
3:8 | Azolla impression fossil from the Tertiary of British Columbia. |