838 



§ I. Sori with a spurious involucre at 

 the inner base. 

 § II. Sori destitute of involucre, or so 

 minute as to be wholly covered by 

 the sorus, and with difficulty ob- 

 served. 



Tribe II.— DICKSONIE.E. 

 Subtribe I. — Hypoderrideae. 



[Genus] I. — Hypoderris. 

 Subtribe II. — Woodsieae. 



[Genus] 2. — Sph.eropteris. 



[Genus] 3. — Diacalpe. 



[Genus] 4. — Arachnoides. 



[Genus] 5. — Woodsia. 



Subgenus I. — Physematiura. 



Subgenus II. — Perrinia. 



Subgenus III. — Woodsia vera. 

 Subtribe III- — Eudicksonieae. 

 [Genus] 6. — Thyrsopteris. 

 [Genus] 7. — Dicksonia. 



Subgenus I. — Balantiura. 



Subgenus II. — Patania. 



(Ultimate divisions or pinnte large, more than 



an inch long). 

 (Ultimate divisions or pinns small, less than 



an inch, generally much smaller). 



[Genus] 8. — Cibotium. 

 [Genus] 9. — Deparia. 

 [Genus] 10. — Loxsoma. 

 [Genus] 11. — Hymenophyllum. 



* Fronds undivided, dichotomuus, or once pin- 



natifid, glabrous, 

 ** Fronds compound, pinnate, or twice or more 

 pinnatifid, hairy or ciliated, entire, or 

 rarely indistinctly denticulate. 



f Fronds pinnatifidly divided, 

 ff Fronds primarily especially below pin- 

 natedly divided. 

 *** Fronds decompound, the margins toothed 

 or serrated, not hairy nor ciliated. 



