PART II. 



GENERAL ARRANGEMENT AND CHARACTERS OF TRIBES AND GENERA, 

 WITH REMARKS ON THEIR RELATIONSHIP ONE TO ANOTHER. 



ABSTRACT OF THE ARRANGEMENT. 



1. EVOLUTION OF THE FRONDS CIRCINATE. 



This includes all Ferns except the small tribe Ophiorjlos- 

 facece, in which the vernation is straight. 



A. Ring of Sporangia vertical (Order Potypodia- 

 cea>, E. Br.} 



DIVISION I.-EREMOBRYA. 

 Fronds solitary, lateral, and articulate with the caudex. 



Tribe 1. OLEANDREJJ. 

 Gen. 1. Oleandra, Cav. 



Tribe 2. DAVALLIE. 

 Gen. 3. Davallia, Sm., Humata, Cav., Leucostegia, Pr. 



Tribe 3. POLYPODIES. 

 Gen. 28. Ex. Polypodium, Phymatodes, Drynarla. 



Tribe 4. HYMENOLEPIDLE. 

 Gen. C. Ex. Drymoglossum, Hymenolepis, Neurodium. 



Tribe 5. PLATYCEREJE. 

 Gen. 1. Platycerium. 



