enl NE 
INTRODUCTION 8 
Professor S. M. Tracy, Biloxi, Miss.; Professor A. A. Tyler, 
Tucson, Ariz.; Professor L. M. Underwood, Kingston, R. I. ; 
Percy Wilson, Bronx Park, New York City; Professor E. O. 
Wooton, Mesilla Park, N. M. 
Besides contributing material nearly every person mentioned 
ip the list has aided me in other ways. Some have contributed 
valuable notes and suggestions, others type specimens for examina- 
tion. Acknowledgments are also due Dr. C. B. Plowright and 
Mr. E. S. Salmon for valuable aid, the former for the contribution 
of type material, and the latter for like service and also for opinions 
regarding types deposited in the Kew herbarium. 
The illustrations are referred to with an apology. No attempt 
at artistic arrangement has been made. If they show facts of form 
and structure, they will serve the purpose intended and at the same 
time be all that time and artistic ability would warrant. The 
original plan contemplated illustrations of such species only as 
had not been hitherto figured; but as work progressed, many 
figures were so inaccessible, a few so inaccurate, and all drawn to 
such varying scales that it was decided to figure anew all forms 
studied, for the purpose of convenient comparison. Unless other- 
wise specially stated, all drawings are made to the same scale ; 
that is, perithecia are magnified 35, asci 230, and spores 310 
diameters. An exception should be noted in the case of the 
last plate which has been prepared after my removal to another 
location where the same optical combinations were not available. 
All drawings were outlined with the camera lucida, and, with the 
exception noted above, the same combinations were used for like 
structures. This arrangement, it is believed, will secure a better 
basis for comparison than could otherwise be obtained. It is to 
be understood that certain features of the illustrations could not be 
easily represented by the use of the camera lucida. For instance, 
the hairs of the perithecia are drawn quite diagrammatically and 
are represented by a single stroke of the pen. The paraphyses 
were invariably drawn free hand from camera lucida drawings 
made of small sections usually near the base and apex of the fila- 
ment. However, all perithecia, asci and spores, have been out- 
lined by the aid of the camera. The text figures are mainly copies 
of illustrations gleaned from various sources and introduced for 
