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 the Jrofid^ wavy, 

 continuous, separating at its inner edge. 



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



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

 ish, central masses. 



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



bedded in the edge of the frond. Cover marginal, 

 pitcher-shaped, of one leaf, opening outwards. 



473. HYMENOPHYLLUM. Caps, in roundish masses, 



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

 compressed, of two valves, opening outwards. 



^* Capsules, or seeds, ^iscitJiout any distinct elastic 

 ring. 



478. EQUISETUM. C^/Z^ms terminal. ^S^'^^/s separately 



embraced by 4 spiral filaments, presumed to bear 

 pollen. 



476. OPHIOGLOSSUM. Spike 2-ranked. Capsules 



bivalve, imbedded. 



474. OSMUND A. C/w5if^r branched. C«p5. stalked, naked, 



globular, with a striated protuberance. 



475. BOTRYCHIUM. Common stalk compound, flatten- 



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



477. LYCOPODIUM. Caps, 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 



o^ the frond. Seeds rough. 



