PAL.^OZOIC CONE-GENUS LEPIDOSTEOBUS. 537 



Fig. 32. Tangential section through a sporophyll pedicel, a little further from the axis thaua in fig, 31, 



but not so far out as to show the attachment of the sporangium. Sedgwick Mus. Coll., 



Slide 280. ( x 14.) 



(5/?m.^^?• = sporangium wall; .ry. — xylem ; ^A. == so-called phloem ; jt3flr. = parichii0j< space.) 

 Fig, 33. Tangential section through a sporophyll pedicel further from the axis than fig. 32. The 



attachment of the base of the sporangium is shown. The sporangium lias dehisced and the 



walls are displaced. Sedgwick Mus 



) 



(j:>?^, = wing of pedicel; 5c.c. = sclerised cushion; ^.J9. = kecl of pedicel; /./.avascular 

 bundle of sporophyll ; 5p??^.^^. = sporangium wall ; 5/.r.=^ ridge of sterile tisjsue forming floor 

 of sporangium ; ^/.J9. = sterile upgrowth from floor of sporangium.) 

 Fig. 34. Vascular bundle from the sporophyll base marked Lp.b,{c) in fig. 31. Sedgwick Mas, ColL, 



Slide 280. (x318.) 



(.^j'.^xylem ; j9/t,= so-called phloem,) 

 Fig. 35. Obliquely transverse section through the vascular bundle of a sporophyll near the distal end 



of the pedicel^ showing xylem 

 Coll., Slide 279. (x 318.) 



(td.). Sedgwick Mus, 



Fig- 36. Part of a transverse section of a sporophyll lamina to show traces of periderm formation near 



the dorsal surface. Sedgwick Mus. ColL, Slide 278. (x 318.) 

 Qo^. = periderm ; ep.l 



) 



Fig. 37 a Sc b. Transverse sections through the columnar layer of the wall of the sporangium shown in 



fig. 32. The upperside represents the inaersurface. Sedgwick Mus. CoIL, Slide 280, (x 318.) 

 Fig. 37 a represents a part of the wall close to the dehiscence line^ while fig. 37 J represents 

 part of the thicker region of the wall which is adjacent to the sporophyll pedicel. 



Pig. 38, Tangential section through the columnar layer of the sporangium wall. Sedgwick Mus, ColL, 



Slide 279. (x 318.) ' 

 Fig. 39. Spores. Sedgicick Mus. Coll, Slide 279. ( x 318.) 



Plate 26. 



Lepidostrobus gracilis, sp. nov. {continued). Figs. 40-42. 



Fig. 40. Tangential section passing through a sporophyll and the base of a sporangium. Sedgwick Mus, 



Coll., Slide 279. (x 193.) 



{k.p. = lieel of pedicel ; j7.w;. = wiug of pedicel' ; 5C.^. = lateral sclerised cushion of pedicel ; 

 ^i'- = xylem ; /?/(. = so-called phloem ; 5^m.M;. = sporangium wall ; 5/.r. = ridge of sterile tissue 



occupying base of sporangium.) 



Uff 



The sporophyll pedicel is torn. Sedgwick Mus. Coll., Slide 278. (x 14.) 



(/, = lamina of sporophyll ; ^y. =: xylem ; /./. 



) 



Fig. 42. Transverse section of the sporophyll trace near the base of the lamina. The tissue surrounding 



tlie bundle is broken, and probably some transfusion tissue is lost on tiitf right-hand side. 



Sedgwick Mus. Coll., Slide 279. ( x 318.) 

 (^y. = xylem ; t.t. 



) 



LePIUOSTROBUS OLDHAMIUS, Will., f, MINOR, FJgs, 43-49.. 



Fig. 43. Radial longitudinal sections of two sporophylls. Binney Coll., AM. 27. ( x 14.) 



(^aar. = axis; /.;?. = .sporoi)hy 11 pedicel; /. = sporophyll lamina; /.A.=heel of sporophyll 

 lamina; /o.;?. = ligular pit; />«r. = parichriOS ; #j»/«.ei?. = sporangium wall; «/>. = spores; 

 xy. = \y\e^xi ; ^^ = transfusion trachcides. The region marked with an asteris 



)r scale in fig. 44.) 

 ^^1•:C0XD SERIES.— BOTA^'Y, VOL. Till. 



d 



2 



