250 Class XXIV. Order L 



Class XXIV. CRYPTOGAMIA. Fructifica- 

 tion anomalous or concealed. 



Order 1. FILICE8. Ferns. 



S81. POLYPODIUM. Fructification in roundish, 

 scattered dots, not marginal ; involucre none. 



285. ASPIDIUM. Fructification in roundish, 

 scattered dots ; involucre umbilicate, opening near- 

 ly all round. 



/ 



286. DlCKBONiA. Fructification in roundish, 

 distinct, marginal dots ; involucre double, one su- 

 perficial, opening outward ; the other from the in- 

 flexed margin of the frond, opening inward, 



287- ASPLENIUM. Fructification in scattered, 

 straight lines ; involucre lateral, opening inward. 



288. ADIANTUM. Fructification in distant dots 

 or lines upon the margin of the frond ; involucres 

 membrauacequs, from the indexed margin of the 

 frond, opening inward. 



389. PTERIS. Fructification in a continued, 

 marginal line ; involucre from the indexed margin 

 of the frond, opening inward. 



290. ONOCLEA. Fructification crowded, occu- 

 pying the whole back of a separate frond ; involu- 

 cres from the margin of the frond, opening inward. 



S91. OSMUND A. Fructification crowded, some- 

 what globular, pedicelled, disposed on the back of 

 ihe frond, or in separate racemes. 



