Scott. — On Peduncle of Cycadaceae. 419 
Fig. 4. Stangeria paradoxa . Similar section from the middle part of another 
male peduncle, c. small -celled tissue in which the centripetal xylem is situated ; 
p. pith, x about 85. 
Fig. 5. Stangeria paradoxa. Radial section through a vascular bundle in 
a male peduncle. The centripetal xylem is here shown at the border of the pith, 
/, separated by narrow-celled tissue, c, from the spiral tracheides, px. x about 85. 
Fig. 6. Cycas revoluta . Transverse section of a vascular bundle from the stalk 
of a carpel, for comparison with Fig. 3, from the peduncle of Stangeria. To the 
left a small inverted cortical bundle is shown, x 85. 
PLATE XXL 
Fig. 7. Stangeria paradoxa . Radial section through a vascular bundle in 
a male peduncle. The centripetal xylem begins with a spiral tracheide. x 130. 
Fig. 8. Stangeria paradoxa. Transverse section of a concentric cortical bundle 
from the middle part of a male peduncle, x 1 30. 
Fig. 9. Stangeria paradoxa. Similar bundle, from the lower part of another 
peduncle. There is here a central parenchyma in which the protoxylem is 
embedded. Sieve-plates are indicated on the radial walls of some of the sieve- 
tubes. x 130. 
Fig. 10. Zamia Loddigesii. Transverse section of a vascular bundle from the 
peduncle of a female cone, showing centripetal xylem. x 85. 
Fig. 11. Zamia Loddigesii. Radial section of a similar bundle, x 85. 
Fig. 12. Stangeria paradoxa . Transverse section of a vascular bundle from 
a carpel. The centripetal xylem is very slightly developed, x no. 
Fig. 13. Stangeria paradoxa. Similar bundle from a stamen, x no. 
