PLATE XI 



Ribes aureum (23a and 23b) 



Vessels present; vessels forming complete concentric bands 

 within the growth ring, usually one vessel in width, vessels 

 of successive bands in any one growth ring are of similar 

 size; vessels predominantly solitary or in pairs, except for 

 initial vessels which may be contiguous; perforation plates 

 scalariform; rays three to many cells in width, often mas- 

 sive, dispersed between uniseriate rays. 



Ribes cereum (24a and 24b) 



Vessels present; vessels forming interrupted concentric 

 bands within the growth ring, usually 1 vessel in width; 

 vessels of successive bands in any one growth ring not 

 similar in size; the initial vessels are usually markedly 

 larger than succeeding ones; vessels predominantly soli- 

 tary or in pairs, except for initial vessels which may be 

 contiguous; perforation plates scalariform; rays three to 

 many cells in width; often massive, dispersed betwwen 

 uniseriate rays. 



