^50 CBYPTOGAMIA. FILICES. 



Fronds simple, pinnatlfid, or more or less numerouii^ly, 

 compounded. 



Species. 1. P. vnJgare- 2. virginianum. 3. incamim. 

 Pluk. Phyt. t. 289. t. 1. 4. hejcagonopterum. 5. connectile. 

 6. calcareum. 



3X8. WOODSIA. R. Brown. 



Sori roundish, scattered. Indusiiim caliciform, 

 open, with acrinite margin, including the pedi* 

 ceJlate capsules. 



Habit that of the preceding genus. 

 Species. 1. W. hyperborea. 2.iive?isis. Both species- 

 also indigenous to h urope. 



319. ASPIDIUM. Swart^, (Shield-fern.) 



Son roundish, scatteied. Indusium umbili- 

 cate or openins^ on one side. 



Species. I. ^ . cicutarium. 2. acrostichoiiles- o.novebo- 

 racense. 4. Thehjptens. 5. cristatnm 6- obtusum. 7- acn- 

 leatnm. 8. marginale. 9FiliX7nas. \0. intenncdinm. 11. 

 spinulosum 12. dilatatum. 13. bulbiferiun. 14. aspleiiioides. 

 15. Filix femina. •Iff. ang us turn. \7- pimctilobiim. 18. a^o- 

 marium. 19. lenue. 20. riifiduhim. 



820. ONOCLE \. L, (Sensitive Fern.) 



Capsules «< -'isrly covering the back of the 

 frond. Indusia squamit'orm, connate iii the 

 form of berries and not expanding. 



sterile fronds deeply pInnatiMd, fertile ones bipinnately 

 divided. 



Species. 1. O. sensibilis. 2. obtusilobata. — A NorlU 

 American genus. 



321. STRUTHIOPTERIS. JVilld. 



Capsules densely covering the back of the 

 frond. 7/idiisia squamiform, marginal, opening 

 internally. 



Nearly allied to the preceding genus. Fronds bipiiv 

 n^tifid. 



Sj^EpiEfs. 1. S. pejw^yhamca. A genus scarcely distin.ct 



