236 



DE. AGNES AEBEE ON THE 



Fig. 22. The xylem of a sporopTiyll trace in transverse section shortly after it has left the central 



cylinder. The same bundle is 

 Binney ColLy Q. a. 1. (x 318.) 



t 



(In this figure and in fig. 23 the lower side of the trace faces the centre of the axis.) 

 Fig. 23. A sporophyll trace in transverse section, passing througli the sclerised inner cortex. The same 



bundle is marked Lt.^ in the photograph reproduced in PL 21. fig. 4. Binney ColL, Q. a. 1. 

 (X 318.) 



(,2?y. = xylem j z.c.=inner cortex; r.c.5. = inner cortical sheath enclosing sporophyll trace.) 

 Fig. 24. Tetrad of spores. Binney ColLj Q.a. 1. (x 318.) 

 Fig. 25. Mature spores showing the triradiate marking land equatorial border. Binney ColL^ Q.^. 4. 



(x 318.) 



Plate 25. 



Lepidostrobus Binneyanus, sp. nov. (continued). Figs. 26-30. 



w 



Fig. 26. Tangential section of a sporophyll and sporangium somewhat crushed and distorted. Binney 



Coll., Q.a.4. (x 23.) 



(j7.t/;.=wing of pedicel ; A,^.=:keel of pedicel; 5c.c. = sclerised cushion ; /,^. = sporophyll 



trace ; ^^m.w;. = sporangium wall ; */.r. = ridge of sterile tissue forming floor of sporangium.) 

 Fig. 26 a. Part of the sporophyll and sporangium shown in fig. 26, more highly magnified. Binney Coll^ 



a a. 4. (x 47.) 



(^.%?. = wing of pedicel ; Lp. = kee[ of pedicel ; 5c.c. = sclerised cushion ; /./. = sporophyll 



trace; /./. = transfusion tracheides; ep. = epidermis ; Ay.=hypoderma ; 5^m.«^. = sporangium 



wall ; 5/.r.=ridge of sterile tissue forming floor of sporangium.) 

 Fig. 27. A small part of a tangential section passing through a sporophyll pedicel, similar to that shown 



in fig. 26 a. The sterile ridge (st.rJ) in this case contains numerous transfusion tracheides 



(/7.), and there is apparently a median plate of sterile tissue [st.p.) arising from the sterile 



ridge. Binney ColL, Q. a. 3. ( x 77.) 



(5j9m.w;.= continuation of sporangium wall down the side of the sterile ridge; sex. 

 sclerised cushion of sporophyll pedicel.) 



Fig. 28. Xylem elements and some transfusion tracheides from a tangential section of a sporophyll similar 



to that shown in figs. 26 and 26 a. Binney ColL, Q. a. 4. ( x 318.) 

 (xy. = xylem ; t.t. = transfusion tracheides.) 

 Fig. 29. Part of the dorsal surface of one of the transverse sections of sporophyll lamince photographed 



in PL 22. fig. 6, to show radial arrangement of cells indicating periderm formation (pd.). 



Binney Coll., Q. ^S. 2. ( x 318.) 

 Fig. 30. Cellular outgrowth from the ventral surface of a sporophyll lamina. This outgrowth is seen on 



a smaller scale, marked ho.*, in the transverse section photographed in PI. 22. fig- 6. 



Binney ColL, QL.^. 2. (x 318.) 



Lepidostrobus gracilis, sp, nov. Figs. 31-39. 

 Fig. 31. Obliquely tangential section through three sporophyll bases. The two lower sporophylls (b 



free from the cone axis. Sedgwick Mus, Coll., Slide 280. ( X 14.) 



( 



(/.^.6. = base of sporophyll pedicel; a^.=?=xylem; ^A. = so-called phloem; j9a!r.=parichnos 



space.) 



