276 



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 ih& frond, wavy, 

 continuous, separating at its inner edge. 



470. ADIANTUM. Ca/)5. on the back of each rounded, 



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

 ish, central masses. 



472. TRICHOMANES. Caps, in oblong messes, im- 



bedded in the edge of the frond. Cover marginal, 

 pitcher-shaped, of one leaf, opening outwards. 



473. HYMENOPHYLLUM. Caps. \\yrowwdi\^ masses, 



imbedded in the edge o{\k\e. frond. Cover marginal, 

 compressed, of two valves, opening outwards. 



** Capsules, or seeds, without any distinct elastic 

 7-ing. 



478. EQUISETUM. Catkins terminal. Seeds separately 



embraced by 4 spiral filaments, presumed to bear 

 pollen. 



476. OPHIOGLOSSUM. Spike 2-ranked. Capsides 



bivalve, imbedded. 



474. OSMUND A. C/ws^^r branched. Cops, stalked, naked, 



globular, with a striated protuberance. 



475. BOTRYCHIUM. Common stalk compound, flatten- 



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



477. LYCOPODIUM. Caps, axillary, solitaiy, 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. 



