PLATE XXIII.— RADIAL SECTIONS. 



.( and /(, PiNUS kciiinata. m. r., medullary rays; p., parenrhyiiwi of saml^; Ir.. iTausvirsi^ traclniils of rays; ». ;)., 



simple pits: h. p., bordered pits; c. Ir., common tracbeids. 

 C, PiNi'S iiETEnoi'iiYLLA. su. «'., summcrwood; other letters as iu J. 

 Originals magnilicd "f"; illustrations, 2^0. 



148 



