EXPLANATION OF THE PLATES. 



Genera of Filices. 



TAB. IX. 



POLTPODIUM. Plant; piece of tlie frond (1) ; a magnified sporangium with its stalk, 

 and another bursting and discharging spores, of P. vulgare, L. 



STRUTHIOPTEKIS. Pinna of the sterile frond (1) of 8. Germanica, Wittd.; portion of a 

 fertile frond (2) ; a piece of one pinna cut off to show the manner in which it is rolled 

 up (8) ; and a portion of the last, magnified, with one side unrolled (4) ; towards the 

 base the sporangia all removed, to show how the fruit-dots are borne each on the 

 middle of a vein. 



ALLOSORUS. Sterile and fertile plants of A. gracilis, Presl.; and a portion of the fertile 

 frond (1) enlarged, with a piece of the marginal indusium turned back to display 

 the fruit ; the sporangia are all removed from the fruit-bearing tips of the two forks 

 of the lower vein. 



TAB. X. 



PTEEIS. A pinnule of P. aqnilina, Z., var. caudata; and a piece of one of the lobes, 



enlarged (2), the margfcal indusium rolled back on one side, displaying the fruit ; 



the sporangia all removed from the lower part to show the receptacle that bears 



them, viz. a cross line connecting the tips of the veins. 

 ADI ANTTTM. Piece of the frond of A. pedatum. L. (1) ; a pinnule somewhat enlarged (2) ; 



and a piece of one (8) more enlarged, with the indusium of one fruit-dot turned back 



to show the attachment of the fruit. 



OHEILANTHES. Small plant of C. vestita (1) ; and a fruit-bearing pinnule, enlarged (2) 

 WOODWARDIA. Portion of the sterile (1) ana of the fertile frond (2) of W. angusti 



folia ; a piece of the latter enlarged (8) ; piece of the frond of "W. Virginica (4) ; and 



part of a fruiting lobe (5), enlarged. 



TAB. XI. 



CAMPTOSORUS. Plant of 0. rhizophyllus, Link.; and a portion of a frond, with fruit- 

 dots, enlarged (1). 



SCOLOPENDRIUM. Tip of a fertile frond of 8. offlcinarum; and (2) a piece enlarged, 



with two fruit-dots. 

 A8PLENIUM. A pinna of A. thelypteroides, Michx. (1) ; and part of a lobe (2) in fruit, 



enlarged. 



