SPHENOPHYLLEAE 95 



which has been found at all stages of growth, is like 

 that of the former species, but there are some not 

 unimportant differences of detail. At each of the three 



Fig. 40. — Sphenoj>7iylliim insigne. Transverse section of rather young stem, showing 

 triangular primary wood, with a canal at each angle, marking the protoxylem, 

 then secondary wood, remains of phloem, and the primary cortex, showing two of 

 the furrows, x about 30. From a photograph. Phil. Trans., W. and S. Will. 

 Coll. 919. 



angles of the primary wood is a canal, formed, no doubt, 

 in consequence of the disorganisation of the primitive 

 tracheae (Fig. 40). The tracheae generally have a 

 scalariform sculpturing, instead of the numerous rows 

 of bordered pits characteristic of other species. A still 



