50 



Our Native ferns. 



*Isosporous. 

 Class I. — EquisetinvE. 



Order i. — Calamariace<e. (Extinct.) 

 Order 2. — Equisetace^. Including Equisetum. 

 Class II. — FiLiciN^. 



t Vernation erect or inclined. 

 Order 3. — OpHiOGLOSSACEiE. Including Ophioglossum, 

 Botrychium, etc. 

 tt Vernation circinate. 

 Order 4. — Marattiace^. Including four genera, mostly 



tropical. 

 Order 5. — Filices. Including the many genera of ferns. 

 Class III. — Lycopodin^. 



Order 6. — Lepidodendrace^. (Extinct.) 

 Order 7. — Sigillariace^. (Extinct.) 

 Order 8. — LvcopodiacE/E. Including Psilotum, Lycopo- 

 dium, etc. 



**Heterosporous. 

 Class IV.— Ligulat^. 



Order 9. — Selaginellace^. Including Selaginella. 

 V, Order 10. — Isoetace/E. Including Isoetes. 



Class V. — Rhizocarpe^. 



Order ii.— MarsiliacE/E. Including Marsilia,Azolla, Pi- 

 lularia, etc. 



