98 



CHE ABLE 



2 ; 



1 



Fig. 1-20. All are figures of conventional structures drawn freehand; details of 

 cell contents and side walls generally omitted.— Fig. 1. Outline of shortened 

 tracheid, bordered pits as in fig. 6, 7, or 12-14.— Fig. 2. Vessel member, with scalari- 

 form perforation plates; perforations in black.— Fig. 3. Outline of wood fiber (with 

 pits as in fig. 8). — Fig. 4, 5. Vessel members with single perforation (black) in 



