ACKNOVJLEIIGEMKNTS 



It is a pleasant privilege to be able to call your attention to the 

 source of help in the making of this syllabus. 



The cost of printing and the initial typing costs were paid from a 

 Rockefeller Foundation Grant awarded to the activities of S-19 Regional 

 Hematology Project for making information more available to new workers 

 and to students, particularly, in phytonematology. The work time allow- 

 ed to the authors and Mrs. Glenda Barnes, who did much of the final man- 

 uscript typing, by Dr. J. A. Lyle, Head of the Department of Botany and 

 Plant Pathology of this Institute, certainly deserves special mention. 

 Wiat had begun as a spare time effort took much more time than just that 

 before it was finished. 



The loaning and contribution of printed materials from vai'ious sources 

 was of great help in completing and updating cei'tain groups and the gen- 

 erosity of a number of people should be pointed out. Hence, our acknow- 

 ledged gratitude tos E. Altherr, I. Andrassy, E. G. Dougherty; E. Gadea; 

 S. A. Gerlach, H, A. Kreis, M. Luc, A. H. Meyl, F, Paesler, the late 

 J. H. Schuiirmans - Stekhoven, W. Stefanski, A. L. Taylor, and W. Wieser. 



Special appreciation is due to a nvimber of workers for their wiULngness 

 to discuss the systematic positions of various taxa and the groups at all 

 levels. For this and other help it seems like a small token, indeed, but 

 to list their names: A. D. Baker, B. G. Ghitwood, E. C. Dougherty, J. B. 

 Goodey, A. H. Meyl, A. C. Tarjan, G. Thome, and W. Wieser. 



Finally, and especially, we want to point out that the great convenience 

 and utility of the taxonomic syllabus prepared by M. W. Allen in 1950 im- 

 pressed upon us through the years we have used it the value of producing 

 another such compilation of keys extended and brought up as much as poss- 

 ible to the present time, 



Bruce E. Hopper and Eldon J. Cairns 



Alabama Polytechrdc Institute 

 Auburn, Alabama 



