viii PREFACE TO THE AMERICAN EDITION 



any opinions expressed therein. The papers of Faull on the Puccinias- 

 treae and of B. O. Dodge on the rusts of Rubus have necessitated extensive 

 alterations in the Uredinales. 



Personally, I feel too much weight has been attached to the differences 

 between the sticho- and chiastobasidia; hence I am not at all in sympathy 

 with the segregation of the Cantharellales as a separate order. There are 

 no other constant morphological characters to separate the two types, 

 but I have retained this segregation in a less exaggerated form as pre- 

 senting a viewpoint which should stimulate further work to prove its 

 truth or falsity. 



Obvious errors in synonymy have been corrected, with the first 

 mention of a species usually followed by parentheses containing synonyms 

 used in the original papers. To save space, authorities for names have 

 been omitted in the body of the text and given in full, as accurately as I 

 have been able to determine them, in the index. The bibliography has 

 been assembled in a single chapter at the end of the book, again to save 

 space, and has been verified insofar as the books and periodicals were 

 readily available. 



In conclusion, I wish to express my gratitude to the following persons 

 who have kindly loaned me unpublished manuscripts for inclusion in 

 this edition: Professor J. H. Faull of Toronto, for his paper on the 

 Pucciniastreae delivered at the International Congress at Ithaca, 1926; 

 Dr. C. L. Shear and Dr. B. O. Dodge for their paper on Neurospora, 

 delivered at the winter meeting of the Botanical Society of America at 

 Philadelphia, 1926; Dr. L. E. Wehmeyer for his unpublished papers on 

 the Diaporthaceae. Dr. Margaret B. Church kindly read the discussion 

 of the Aspergillaceae and Dr. Roland Thaxter that of the Laboulbeniales, 

 criticizing and adding new information as the result of his unpublished 

 observations on this group. I deeply regret that Dr. Gaumann's 

 illness has prevented his collaboration in this revision. 



Dr. Thaxter has kindly furnished the drawings for Figures 253 to 261, 

 Figure 230 is reproduced from Heald's Manual of Plant Diseases, Fig- 

 ure 234,2 from an unpublished drawing by Louis C. C. Krieger in the 

 Farlow Library, the rest being the cuts used in the German edition, 

 through the kindness of the publisher, Gustav Fischer of Jena. Finally, 

 I wish to acknowledge my gratitude to my wife for her cooperation in 

 preparing the manuscript for the press and reading the proof. 



C. W. Dodge. 

 Cambridge, Massachusetts, 

 December 1, 1927. 



