978 
Carter .— A Reconsideration, of the 
6. Pinus sylvestris , L. Not much transfusion tissue was observed. In 
one case the first transfusion tracheide to appear was quite at the side 
and level with the metaxylem. In no case was any found distinctly on 
the ventral side of the strand. 
7. Sequoia sempervirens , Endl. No adaxial transfusion tracheides 
were found. About the middle of the cotyledon these elements form 
a chain leading out from one side of the bundle. 
8. Sciadopitys verticillata , Sieb. and Zucc. As noted by Hill and 
de Fraine in their paper ‘ On the Seedling Structure of Gymnosperms, I 
transfusion tissue is here exceptionally abundant. It is also very remark¬ 
able for its size and arrangement; it forms two chains leading from the 
Fig. 1. Sciadopitys verticillata. Transverse section of cotyledon near the middle, showing 
abundant transfusion tissue, pxy, protoxylem; t.t., transfusion tissue. In'this and succeeding figures, 
the adaxial side of the leaf is towards the bottom of the page. 
flanks of the xylem in the vascular strand and bending round towards the 
phloem (see Fig. 1). Its arrangement here is very like that seen in the 
leaves of Conifers, and from its appearance there would be little difficulty 
in regarding it as modified centripetal xylem. At the tip of the cotyledon, 
however, a very different state of affairs is found. Here, as was the case 
with Torreya? at the extreme tip, no other sort of vascular tissue is present. 
A little lower down, where protoxylem is distinguishable, the transfusion 
tracheides are abundant before any metaxylem appears. 
9. Cupressus Lawsoniana , Murray. Here transfusion tissue is found 
very near the tip of the cotyledon. It begins in a lateral position, and 
is quite typical of many such beginnings (Fig. 2). 
1 Annals of Botany, vol. xxii, p. 708. 
2 Chick, loc. cit. 
