PLATE LXIV. 



Fig. 47. Tangential section of stem of Q. rubra, showing the number 



and size of medullary rays. X 52. 



Fig. 48. Tangential section, showing same for Q. schneckii. X 52. 



Fig. 49. Tangential section, showing same for Q. coccinea. X 52. 



Fig. 50. Tangential section, showing same for Q. macrocarpa. X 52. 



Fig. 51. Acorn of Q. rubra. X %. 



Fig. 52. Acorn of Q. schneckii. X %• 



Fig. 53. Acorn of Q. coccinea. X Vz. 



FlG. 54. Acorn of Q. macrocarpa. X Vz. 



Fig. 55. Cross section of shell of Q. rubra, x 23. 



Fig. 56. Cross section of shell of Q. schneckii. X 23. 



Fig. 57. Cross section of shell of Q. macrocarpa. X 23. 



Fig. 58. Cross section of shell of Q. coccinea. X 23. 



