CLissrFlOATioir. xiii 



+ 1 Spore-oasea two-valved, bursting Tertioally 



at the apex. King rudimentary, obliquely Tribe 8. 



transTerse near the apex OSMUNDINEffi. 



* * Spore-cases wifhont a Jointed ring. 



[a] Fructifications dorsal on normal fronds, (rer- Order. 



nation circinate or incurved) M AE ATTI ACE^ 



(1) Sori oblong distinct, longitudinally bi- Tribe 1, 



Talyed ... TS.AR&.TTIS'EM. 



(a) Spore-casea'free, crowded in two opposite § 1. 

 linear series AngiopterideSB. 



(b) Spore-cases concrete, in two opposite § 2. 



linear series MarattieSB, 



(2) Sori circular distinct ; spore-cases concrete Tribe 2. 



in a single annular series KATJLFTISSINEffi, 



(3) Sori connate over tie whole surface of the Tribe 3. 



fertile fronds ... ... ... ... ~ 



[b] Fructifications marginal, on rachiform fronds Order. 



or branches, (yernation straight) ... OPHIOGLOSSACEiE. 



LTCOPODAi;ES=Acrogenous plants, with axillary radical or petiolar 

 one- four- or many- celled spore-caees. 



* Spore-cases one- three-celled, in the axils of the Order, 



stem-leaves or Iracts LYCOPODIACE.ffl 



Stemless ; with radical leaves j scape leafless ; § 1. 



spore-cases one-ceUed Phylloglossese. 



§ 2. 

 Stems leafy; spore-cases one- three-celled ... LyCOpodieSB. 



* * Spore-cases ( conceptaclesj one- four- or Order. 



many- celled, radical or petiolar MARSILEACE.® 



Spore-cases one-celled — § 1. 



axiUary at the base of the leaves (radical) ... IsoeteSB. 



clustered or binate, on short leafless branch- § 2. 



es, beneath the floating rooting stems ... SalviuieSB. 



§ 3. 



Spore-cases two- four- celled, radical PilularieSB. 



§ 4. 

 Spore-cases many-celled, radical or petiolar ... , MarsilieSB. 



b3 



