No. 68. Bryological Notes — II, by Elizabeth Gertrude Britton. 



No. 69. The Polyporaceae of North America — XI. A Synopsis of 



the Brown Pileate Species, by William Alphonso Murrill. 

 No. 70. The Polyporaceae of North America — XII. A Synopsis of 



the White and Bright-Colored Pileate Species, by William 



Alphonso Murrill. 

 No. 71. Studies on the Flora of Southern California, by Le Roy 



Abrams. 

 No. 72. Phycological Studies — II. New Chlorophyceae, new Rho- 



dophyceae and Miscellaneous Notes, by Marshall Avery 



Howe. 

 No. 73. Studies on the Rocky Mountain Flora — XV, by Per Axel 



Rydberg. 

 No. 74. The Polyporaceae of North America — XIII. The described 



species of Bjerkandera, Trametes, and Coriolus, by Wil- 

 liam Alphonso Murrill. 

 No. 75. Studies in North American Polygonaceae — I, II, by John 



K. Small. 



