MAPLE 



413 



0.010 to 0.050 mm. in diameter; stone cells occasional, very irregular 

 in outline and very unevenly thickened; starch grains relatively few, 



B 



FIG. 176. Acer spicatum: A, transverse section of bark showing cork (K); a 

 narrow row of thick-walled, tangentially elongated cells (C) ; cortical paren- 

 chyma (P) ; calcium oxalate (Co) ; bast fibers (Bf) ; separation of cells (Br) ; 

 medullary rays (M). B, fragments of powdered drug showing short bast 

 fibers (Bf); parenchyma (P); calcium oxalate (Co) and cork (E). C, 

 tangential section, showing medullary rays (M); calcium oxalate (Co); 

 parenchyma (P); bast fibers (Bf). Drawing by Haase. 



occurring in compound aggregates, the individual grains being from 

 0.003 mm. to 0.010 mm. in diameter. 



