EXPLANATION OF THE PLATES. 735 



Genera of Filices. 



TAB. IX. 



POLTPODIUM Plant; piece of the frond (1); a magnified sporangium Tith it* stalk, 

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



STRUTHIOPTERIS. Pinna of the sterile frond (1) of S. Qermanica, Willd. ; portion of a 

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

 up (3) ; 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. 



PTERIS. A pinnule of P. aquilina. L.. var. caudata; and a piece of one of the lobes, 



enlarged (2), the marginal 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. 

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



and a piece of one (3) more enlarged, with the indusium of one fruit-dot turned back 



to show the attachment of the fruit. 



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

 WOODWARDIA. Portion of the sterile (1) and of the fertile frond (2) of W. angustifolia ; 



a piece of the latter enlarged (3) ; piece of the frond of W. Virginica (4) ; and part 



of a fruiting lobe (5), enlarged. 



TAB. XI. 



CAMPT030RUS. Plant of C. rhizophj llus, Link. ; and a portion of a frond, with fruit- 

 dots, enlarged (1). 



3COLOPENDRIUM. Tip of a fertile frond of S. offlcinarum ; and (2) a piece enlarged, with 

 two fruit-dots. 



ASPLENIUM. - A pinna of A thely pteroidea, Michx. (1) ; and part of a lobe (2) in fruit, 

 enlarged. 



DICKSONIA, SITOLOBIUM Pinna of D. punctilobula, Hook. (1) ; portion of a pinnule 

 (2), enlarged ; and a fruit-dot in its cup-shaped indusium (3). 



TAB. XII. 



CYSTOPTERIS. Piece of the frond of C. bulbifera, Bernh (1) ; a lobe in fruit (2), enlarged ; 

 and a small portion more magnified (3), bearing a fruit-dot with its indusium thrown 

 back. 



WOODSIA. Small frond of W. glabella, K B*. (1> ; a part of a fruiting pinna of the same 

 (2), magnified ; and a separate indusium (3), more magnified : a piece of a fruitful pin- 

 nule of W. obtusa, Torr (4), enlarged; and a fruit with the opened iudusium be- 

 neath (5), more magnified. 



ASPIDIDM. Pinna of A. (Dryopteris) marginale, Swartz (1); and a magnified fruiting 

 portion (2) : piece cf A. (Polystichum) acrostichoiJes (3) ; and a small fruiting por- 

 tion (4), magnified. 



