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THE (iEOLOGICAL HISTORY OF PLANTS. 



tho loaf-hasPH promiiicni, or liave un a|)pfiarance of longitudinal rib- 

 bin;^ prodiicMMl hy Mh! t!X|)aiisiori of tho bark. 



HlrurAure of Stem. — This is not porfnctly prcscrvod in any of 

 my Hix'ciinctiH, l)iit oni; flattciu'd .sp((c-iinon .shows a central medulla 

 with a iijirrow ring of scalariform vtisscils surrounding it, and consti- 

 tuting the woody axis. The structure is thus siniilar to that of L. 

 Jlarcourtii, which I regard as i)rol)ably tho same with tho closely 

 allifid l<iUroi)ean species Jj. Vcllhnmidimm, 



L"(ivfn, — These are luirrow, one-nerved, curving somewhat rap- 

 idly outward (Figs. 4JJ, li, C, \)). They vary fr<jm one to two inches 

 iti length. 



Hoo/h. — I hav(! not seen these actually attached, but they occur 

 very abundantly in the underclays of some en^ct fonists of these 

 plants at Horton Hlulf, and an; of the character of Stiijmnrid; (FigH. 

 yo, HI). In some of the underclays the long, flattxaied rootlets are ex- 

 cessivcily altundant, and show tlu; mark of a central vascular bundle. 



Fruclijicaliun. — (.'onr^s terminal, short, with many snudl, acuto 

 imltricate Hcal(;s. S|)ore-cas(!s globular, smooth (Fig. 41} ("j. i)i\ 

 tho surface of some shales and sandston(!s at Ilorlon there arc innu- 

 m(!rable round spore-c.-ases of this tree about the size of mustard-seed 

 (Fig. 4;{ I''). Iiarg(f slabs are somcrtinufs covered with these, and thin 

 layers of shale are lllhid with flattened sp(!cimens. 



This is the characteristic sfxsciesof the Lower (-arbonif(!rf)US coal- 

 measures, occurring in gnat profusion at Morton HIulI and its 

 vicinity, also at Sneid's Mills near Windsor, Noc;! and Five-Milo 

 River, at Norton ('reek and elsewhere in N(!w Hrunswick (Matthew's 

 collection), and ; ., Antigonish (Iloneyman's collection). 



1 have receiviid from the lowest ('arboniferous beds of Ohif) speci- 

 mens of this speei(!S.* Ac(;ordirig to Rogers and Lestjuereux similar 

 forms occur in the Ves[)ertine of Pennsylvania and in the Lower 

 Carboniferous of Illinois. Jj. Vdthe,imi(inum of western Europe 

 and L. (jlincanum of Russia are closely allied Lower Carboniferous 

 spe(!i(!S.f 



A v(!ry different tyi)e is furnislx'd liy a new species from the 

 middle coal-formati(jn of Clifton, N(;w Ibunswi(!k. 



Les'IUodkndron Cliktonknsk, Dawson. — JIahit of Growth. — 

 Robust, with thick branch(!s, and leaves several inches in length. 

 Terminal branches becoming slender, with shorter leaves. 



* "Journal of (Jeological Society," November, 1862, p. 31.3. 

 f For conipariHons of these sec " Report on IMuuts of Lower Carbon- 

 iferous of Canada," jt. '21. 



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