263 



468. BLECHNUM. Caps, in linear, solitary masses, 



close to the midrib. Cover linear, flat, separating 

 towards the rib. 



469. PTERIS. Caps, in linear, nearly marginal masses. 



Cover from the inflexed margin of the frond, wavy, 

 continuous, separating at its inner edge. 



470. ADIANTUM. Caps, on the back of each rounded, 



reflexed, marginal, distinct cover, in small, round- 

 ish, central masses. 



472. TRICHOMANES. Caps, in oblong masses, \m- 



bedded in the edge of the frond. Cover marginal, 

 pitcher-shaped, of one leaf, opening outwards. 



473. HYMENOPHYLLUJVI. Caps. 'mvoyxm\\s\\ masses, 



imbedded in the edge of \\\q frond. Cover marginal, 

 compressed, of two valves, opening outwards. 



** Capsules, or seeds, mtliout any distinct elastic 

 ring. 

 478. EQUISETUM. CatJcins terminal. Seeds separately 

 embraced by 4 spiral ^laments, presumed to bear 

 2}olle?i. 



476. OPHIOGLOSSUM. Spike 2-ranked. Capsules 



bivalve, imbedded. 



474. OSMUND A. Clusf erhranched. Ca/?5. stalked, naked, 



globular, with a striated protuberance. 



475. BOTRYCHIUM. Common stalk compound, flatten- 



ed. Caps, sessile, naked, globular, simple. 



477. LYCOPODIUM. Cajjs. axillary, solitary, com- 



pressed. 



479. PILULARIA. Common receptacle of 4 cells, con- 



cealing numerous barren and fertile florets. Seeds 

 coated. 



480. ISOETES. Comm. recept. of 1 cell, within the base 



of the frond. Seeds rough. 



