23B OX THE PALAEOZOIC CONE-GENUS LEPIDOSTROBUS. 



1 h 



Fig, 44.. High-power drawing of xylem (xy,) and transfusion traclieides (/./.) from the region marked 



"with an asterisk in the base of the upturned lamina of the lower sporophyll shown in fig. 43. 

 Binney ColL,KM..27. (x 318.) 



Fig. 45. Tangential section passing through a sporophyll and showing what appears to be th,e ligule (?/^.) 



Binney ColL, AM. 27. (x 14.) 



(xy. = xylem ; #./. = transfusion tracheides.) ^ 



L, 



Fig. 46. Tangential section passing through a sporophyll pedicel and sporangium. Binney Coll., 



AM.29. (x 14.) : . : 



{^7?m.?^. = sporangium wall; 5C.c. = lateral sclerised cushion; 5^./?. = plate of sterile tissue 



arising from the sporangium floor.) ' 



F _ 



Fig. 47. Tangential section passing through a sporophyll pedicel bearing an immature or abortive 



sporangium. Binney ColL^ AM, 28. (x 193.) 



(j9.w?.=-wing of pedicel; 5c.e. = sclerised cushion of pedicel; ^jr. = xylem; 5/?m.t^.= spor- 

 angium wall.) ' , 



Fig. 48. Obliquely tangential section of a sporangium wall^ passing through outer columnar layer (o./.) 



and inner thin-walled layer (U.). Binney ColL, AM. 26. (x 318.) 



Fig. 49. Spores. Binney Coll., AM. 26. (x 318.) . ,^ . 



Plate 27. 



Lepidostrobus oldhamius, Will., f. pilosus. Figs. 50-54. 



\. 



rig. 50. Transverse section through the cone at some distance from the apex. U. C.L. Coll., C. 16.«. ( x 6.) 



(r.c. = central cylinder of cone axis; o.c. = outer cortex of cone axis; jy.w;,=wing of sporq- 



L 



phyll pedicel; 5;)7W,ii?, = sporangium wall; 5p. =i spores ; /^.=ligulej /. = upturned lamina of 

 sporophyll.) 



Fig.Bl. Central part of the section shown in fig. 50 more highly magnified. UX.L.CoIL.CAQm. (xGl.) 



(t;.c. = central cylinder of cone axis; m. = space from which the pith has disappeared j 

 »2ar. = metaxylem ; j9;r. = protoxylem ; /.^ = sporophyll trace ; i.c. = inner cortex.) 

 Fig. 52. Transverse section through the apex of the same cone as that from which the sections repre- 



M 



sented in figs, 50 and 51 were taken, passing through the sporophylls' above the top of the 

 axis. Towards the outside the sporophylls are cut through near their apices, and are more 

 triangular in section and more sclerised than those further in, which are cut nearer the base 

 of the upturned lobe. Watson Coll., A. ^2. (x 6.) 

 Fig. 53. Central part of the section photographed in fig. 52, more highly magnified to show the tangled 



{i- 



). Watson Coll., A. 92. ( x 77 circa.) 

 imina of sporophyll.) 



Fig. 54. Transverse section through another cone, so near the apex of the cone axis that the outer and 



inner cortex and the metaxylem are scarcely differentiated. Manchester University Coll., 

 R.386.J. (x 6.) 



(v.c avascular cylinder; /. = upturned limb of sporophyll; 5jd?w.z^, = sporangium wall; 

 /^. = one of the six ligules which occur in this section.) 



4 



Lepidosthobus oldhamius. Will. Figs. 55 & 56. 

 Fig. 55. Tangential section of sporophyll and sporangium from an obliquely transverse section of a cone 



2456. (x 12 circa.) 



) 



Scott Coll., 



(i./. = sporophyll trace j /./). = sporophyll pedicel; 5/»w.w. = sporangium wall ; *p. = spores.) 

 Fig. 56. Transverse section of the outer edge of the upturned limb of a sporophyll to show periderm 



{pd.). Scott Coll., 1200. (x 82.) 



