THE FERX BULLETIN 



71 



CLASS 20. EUSPORAXGIATAE. 



Order Ophioglossales. Gametophyte tuberous, 

 chlorophylless. subterranean : sporophyte with large 

 often compound sporophylls (leaves) certain branches 

 of which are spore-bearing. 



Family 1. — Ophioglossaceae. Ophioglossum, Bot- 

 rychium. 



Order Marattiales. Gametophyte flat, chloro- 

 phyllose. attached by rhizoids : Sporophyte with large, 

 compound sporophylls. 



Family 2. — Marattiaceae. Angiopteris, Marattia, 

 Danaea. 



Order Isoetales. Gametophyte dioecious, the male 

 rudimentary, one celled, very small ; the female larger, 

 many called, but little larger than the megaspore ; 

 sporophyte with an erect stem bearing many crowded, 

 narrow sporophylls. 



Family 3. — Isoetaceae. Isoctcs. 



CLASS 21. LEPTOSPORAXGIATAE. 



Order Filicales. Spores of one kind ; sporangia 

 mostly with an annulus (ring) ; gametophyte monoe- 

 cious, foliose. 



Family 4. — Osmundaceae. Osmunda, Todca. 



Family 5. — Schizaeaceae. Schizaea, Anemia, Ly- 

 godium. 



Family 0. — Gleicheniaceae. Gleichenia. 

 Family 7. — Matoniaceae. Matonia. 

 Family 8. — Parkeriaceae. Ccvat opt oris. 

 Family 9. — Cyatheaceae. Dicksonia, Cythea, Al- 

 sophila. 



Family 10. — Hymenophyllaceae. Hymenophyllum, 

 Triehomanes. 



