PLATE XIII 



Ribes lacustre (27a and 27b) 



Vessels present; growth ring initiated with a band of larger 

 vessels; the vessels become progressively smaller through 

 the growing season; vessels relatively few; vessels predomi- 

 nantly solitary, in pairs, or in various aggregates; perfora- 

 tion plate scalariform; rays three to many cells in width, 

 often massive, dispersed between uniseriate rays„ 



Ribes setosum (28a and 28b) 



(Same synopsis as for Ribes irriguum, page 30) 



