shoati: (d.ij., Fi^;. ), Some ol' MiC cells oi 

 plcrome portion of Gee' ion I i-ciniiin o.C Mic fiill Icn'-t: 

 of the segni. nt uu;. no oner cells or : lie ctvosiile v/ero 

 foiind to do tliis. T;. longitudinal vascular bundle of the 

 sporoctirp is ' lius very mucli more localized tlii^n tliat oi 

 the leaf^v/Iiich has been seen to arise frorti the plerome 

 01 four of th.e sections. The derrnatogen oi ail tJio sec- 

 tions in all the segments of the capsrle splits as in the 

 leaf into epiderinal and hypodermtil layers. Of these the 

 former remains, a.s in the leaf, of one cell in thickness 

 and gives rise to trichomes ajid stomata. The latter as 

 lias been shov.Ti by Russov vnd. in Pilularia by Meunier, 

 devides (hy., Figs. 53, 04) to form the two layoj's of 

 thickened cells of the v;all of the matiu'e capsule, ^nd 

 differs tlius from the one layered hypodermis of the peti- 

 ole (Big. 1; ). In general the periblem of all the sections, 

 in all the segments, gives rise to the fev; layers of loose- 

 1;' pa.ckod cells betv/een ■'"he vascular bundle and the hypocle:- 

 mis. Bet'.veen these cells c?jid the h^T^odemis are formed 

 the small fund irregular ai-- canals, which in the capsule 

 are confined largely to the dorsal side and thus to sec- 

 tions I ;md III (a.c. Fig. 51) • 



It -.vill be best now to examine in det^-.il first the 

 furtlier development of tlie eight or nine soi-al segments: 

 tlien of the three basal s^fiaents anu. xin..ily 01 ohe si.: 



