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Fig. 143. Cross section of a portion of a 
two-year-old stem of tulip tree (Lirioden- 
dron tulipifera) 
Near each side is a primary pith ray, while 
in the center is a secondary ray. 1, first an- 
nual ring of wood; 2, second annual ring of 
wood; 7, pith ray; ca, cambium; ph, phloém; 
8, bast fibers ; p, parenchyma; ¢, cork. (x 65) 
~ S38 lias, 
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Fic. 144. Cross section of 
a portion of a three-year-old 
stem of tulip tree (Lirioden- 
dron tulipifera) with three 
annual rings of wood 
Notice the primary, second- 
ary, and tertiary pith rays. 
(x 75) 
