PLATE XXIII. RADIAL SECTIONS. 



A and R, PINUS KCHIXATA. m. r., medullary rays; p., parenchyma of s:im; Jr., transv.-rse tracheids of rays; . />., 



simple ]>its: 6. p., bordered pits; c. ir , common tracheids. 

 C, PINTS IIKTEUOPHYLLA. su. to., sumiiierwood ; other letters as in .1. 

 Originals magnified *f a ; illustrations, , . 

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