I04 



Our Native ferns. 



Order Ispetaceae. 

 I. ISOETES, L. 



ISOETES LACUSTRIS, L. 

 IsOETES TUCKERMANI, 



A. Br. 



ISOETES BOLANDERI, 



Engelm. 

 IsoETES PYGMiEA, Engelm 

 IsoETES RiPARiA, Engelm. 



ISOETES ECHINOSPORA, 



Durieu. 

 Var. Braunii, Engelm. 

 Var. muricata, Engelm. 

 Var. BooTTii, Engelm. 



ISOETES SACCHARATA, 



Engelm. 



Order Marsiliaceae 



8. IsoETES Californica, 

 Engelm. 



9. ISOETES EnGELMANNI, 



A.Br. 

 Var. gracilis, Engelm. 

 Var. VALIDA, Engelm, 



10. ISOETES MELANOSPORA. 



Engelm. 



11. ISOETES FLACCIDA, 



Shuttleworth. 

 Var. Chapmani, Engelm. 



12. IsoETES Butleri, Engelm. 



13. ISOETES MELANOPODA, 



J. Gay. 



14. Isoetes Nuttallii, a. Br. 



I. MARSILIA. L. 

 Marsilia quadrifolia, L. 

 Marsilia vestita, H. & G. 

 Marsilia uncinata, A. Br 



II. PILULARIA, L. 

 PiLULARiA Americana, A. Br. 



III. AZOLLA, Lam. 

 AzoLLA Caroliniana, Willd. 



4. Marsilia tenuifolia, 

 Engelm. 



5. Marsilia macropoda, 

 Engelm. 



The above list is merely prelimiQary, aad the compiler will be pleaded to receive 

 corrections and especially notes on the distribution of species. It is hoped that an 

 authentic account of the distribution of our native Pteridophyta may be presented to 

 botanists at an early day. Specimens of the rarer species will be thankfully received iu 

 exchange for ferns or other plants. 



