out lit tjie up})Oi* eiUL oi' oao GtuiK o lon.i i iiu iov/er pupil h. 

 or tootli ;. baco of tlie mature Cc'.pr.ule (l.t«. Fig. '). 



Tlie deiTnatogen gives rise as in the petiole to the hypo- 

 doiT.iis, cuicl +0 ihe epidermis with its tridiomee and sto- 

 mata, v/hile between the hypodeiTnis tuid the periblem are 

 formed the small and irrer^ular air canals. Tliei-o c/i-l of- 

 ten more than twenty of tuese, and six on each sido ari':c 

 between tlie periblem a.nd hypodeiTiiis oi sections I .i.. 

 III. It is •••oi't.hy of note 'hat the dermatogen of sections 

 II cdv.. V soon splits hy longitudinal yjiticlines (Fir. 

 50) as was seen in the leaf (Figs. 15, ir), tmd differs 

 tlius from, the dermatogen of the GcJtig sections in th.G soral 

 segments of tlie capsule, as v/e shall see le.ter. None of 

 the mesoph-yll cells eith.er here or elsewhere in the sporo- 

 carp become specialized as tannin reservoirs as we have 

 seen tliem do in the leaf. 



Tlie Capsule. 



TuiTiing now to the development of ■ 'i''^ seventeen or 

 eigiiteen seg-ments of the capsule, we find that each sec- 

 tion forms plerome an dermatogen as in he stalk, v'itli 

 the periblem between (pl.,pb.,'j... Figs. 45 - 47, 51 ), bui 

 LiiaL only the two plerome portions of section I take 

 part in formin dorsal bimdle.o- < its 



