544 



The Ohio Naturalist. 



[Vol. XV, No. 8, 



b.pvyt. 



Evyrt,--- 



fcpT.t. 



SCALf. DIVISIONS •.-ji T-m- 



Fig. 2. 



ray ^lec't iorf "'"^ """ °^ ^^'^^^ canadensis, showing uniseriate medullary 

 r. t. ray tracheids. 

 r. p. ray parenchyma, 

 w. t. wood tracheid. 



h. b. p. s. half bordered pits in section 

 D. p. w. t. bordered pit of wood tracheid 

 D. p. r. t. bordered pit of ray tracheid 

 s. b. p. semi-bordered pit of ray parenchyma 



lion. 



