486 CRYPTOGAMIA. 



enced hand, according to the principle 1 

 have suggested, of retaining in them such 

 genera only as have a permanent difference 

 in the accessory as well as the essential 

 parts of their flowers, their bulk being by 

 such a reformation uracil diminished, it 

 mi<rht be advisable to reduce them to one 

 Class, in which the slender remains of Pobj- 

 gamia might commodiously be included, 

 and the title of such a Class should be I)i- 

 dhria, expressing the two distinct seats, or 

 stations of the organs of fructification. 



Class 24. Cryptogamia. Stamens and Pis^ 

 tils either not well ascertained, or not to 

 be numbered with any certainty. Orders 5. 



1. Filices. Ferns. The parts of their flo\yers 

 are almost entirely unknown. The fructi- 

 fication, taken collectively, and proved to 

 be such by the production of prolific seeds, 

 grows either on the back, summit, or near 

 the base of the frojid. Some are called 

 annulate?, annulated, their capsules being 

 bound with an elastic transverse ring ; 

 others thecatee, or more properly exannu- 

 'latce^ from the want of such an appendage, 



