POLYPODIACE^E. 



15 



borea is a Scotch species, and ilvensis, British ; W. glabella 

 and Perriniana are North American, and Caucasica is from 

 the Caucasian mountains : these will even bear the open 

 air, but look well mixed with other ferns in the greenhouse. 

 Besides these, there are alpina, infidula, mollis, and obtusa. 

 They are all of small size, with pinnated fronds. 



GRAMMITIS. 



Gen. Char. (Cryptogamia Filices.) Sori linear, transverse, con- 

 cealed under chaffy scales : no indusium. 



From the Greek word gramma, a letter, as the sori are 

 placed so as to have some resemblance to letters. G. Aus- 

 tralia, a species from New South Wales, is often grown in 

 the greenhouse; and there are others, but they require stove* 

 heat. 



POLYPODIUM. 



Gen. Char. {Cryptogamia Filices.) Sori in little round scattered 

 convex spots : no indusium. 



Named from the Greek word for many and foot, on ac- 

 count of the multitude of roots. The lover of Ferns is 

 familiar with this noble genus, from the English species 



