GEITEBA OF PEEK'S: 



II I] Ring more or leas obliqitely veriicalj nearly^ com- 

 plete, narrow; spore-cases crowded, sessile or 

 sub-sessile, oblique-laterally compressed jrr sub- 

 compressed, bursting horiumttally 



[a] Sori involuorate, i.e., indusia inferior ; (recep- 

 tacles elevated) 



Tribe 2. 

 CYATHEINEa;. 



§ 1- 



.. ThyrsopterideaB. 



§ 2. 



Cyathese. 



§ 3. 

 Alsophileae. 



(1.) rructifications ttyrsiform ... 



(2.) Frnctificationa dorsal 



[b] Sori naked, i.e., witliout indusia ; (receptacles 

 elevated) 



II II II Bing sub-oblique,nearly complete, broad; spore- 

 cases few, sessile, gibbous, bursting horizontally. 



(Kigid flabelliform gleichenoid ferns, with 



dorsal oligocarpous sori, covered by um- Tribe 3. 



bonato-hemispherical peltate indusia) . . . MAT0NINE31. 



I] II II II Ring horizontally or rarely obliquely trans- 

 verse, complete; spore-cases sessile or sub-sessile, 

 usually vertically compressed, bursting longitu- 

 dinally, i.e.f vertically 



[a] King zonal, i.e., spore-cases girt by the ring. 



(1) Sori dorsal; (fronds rigid opaque with oligo- 

 carpous sori, and globose-pyriform spore- Tribe 4. 

 cases) GLEICHEiriNE.a:. 



(2) Sori extrorse-marginal ; (fronds usually pel- 

 lucid membranaceous, with polycarpous sori Tribe 5. 



and lenticular spore-cases) TuiCB.OISASIS'EM. 



[b] Eing apical, i.e., spore-cases crowned by the 



convergent striffl of the ring^radiate- Tribe 6. 



striate at the apex SCHIZailNE^. 



(1) Strise united at the apex, without any vacant 



space, (spore-cases attached laterally) ; scan- § 1- 



dent plants Lygodieae. 



(2) strise disjoined, forming an orbicular apical 



vacuity, (spore-cases attached basally) ; § 2. 



dwarf herbaceous plants ... ... ... Sclliz%e£e 



II II II II Bing rudimentary, or incomplete {wanting one- 

 third or more); very broad, flat obliquely verti- 

 cal; spore-cases sessile or sub-sessile, globose, 



(Aquatic annual proliferous ferns, with Tribe 7. 



contracted fertile fronds) 



CERATOPTERlDINEa:, 



