The Anatomy of Dioon edule, Lindl. 227 
petal xylem can be detected in this position, this fact being in 
agreement with the condition found by Scott in Stangeria 1 . 
Fig. 39. T.S. collateral cauline bundle from cortex of base of peduncle, xy. 
xylem ; pli , phloem ; px., protoxylem ; cryst., sphere crystal. 
Fig. 40. T.S. concentric cauline bundle from the cortex of the base of the 
peduncle, xy. 1., primary xylem; x.y. 2., secondary xylem; trf., 
transfusion tracheids. Other letters as in Fig. 39. 
Higher up in the peduncle 3 centripetal xylem appears in the ill- 
marked perimedullary zone in quantity comparable with that in 
1 Ann. Bot. XI., p. 403, 1897. 
2 Owing to the absence of all but about 2 cm. of the base of 
peduncle, the investigation was continued on laboratory spirit- 
material of male and female cones. 
