EXPLANATION OF PLATK XIX. 



[Figures natural size, except when otherwise- noted.] 



Fig. a, branch bearing male inflorescence; 6, young fascicle of leaves (spring); c, d, forms of mature leaves; e. 

 transverse section of leaf bundle showing structural characters of the leaf (as explained Cor Pinux echinata) f, f; 

 magnified '20 diameters. 



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