XXXVI] 



CYCADEOIDEA 



377 



pursues a straight course to the leaf -base (fig. 510) where it 

 breaks up into several branches (fig. 538, B). Both leaf -trace 



FIG. 510. Cycadeoidea sp. A piece of stem showing (A) the persistent leaf -bases 

 in side-view and at 6 the scars where the bases have broken off, and (B) 

 the inner face of the same piece with the exposed leaf-traces passing into 

 the leaves; one of the traces is seen at t in fig. A. (From a specimen in the 

 British Museum; \ nat. size.) 



FIG. 511. Cycadeoidea Gibsoniana. Stele in the cortex. 

 Museum, 8406.) 



(British 



and peduncle stele are given off from the lower edge of a me- 

 dullary ray. In the parenchymatous cortex large secretory canals 

 (fig. 518, B) are a conspicuous feature, and accessory cortical 



