AUTHOR'S PREFACE. vii 



(Easter, 1894), but also during the time of proof-re.idinu up 

 till the following Christmas. 



Reference to the book will be rendered easier by the numerous 

 illustrations, which are almost exclusively tin- work of the author, 

 and reproduced either from drawings or from photograph- <>f tin* 

 living objects, in many cases taken /// .s/V//. I consider it more 

 essential to illustrate the lathita* <>f patholu^ieal objeets rather 

 than to give drawings of microscopic subjects; those one may 

 tii itl in other works. Some of the illustrations are copied from 

 the excellent plates of Tulasne, Woronin, De Bary, Klelx, peess, 

 Colin, and Robert Hartig ; while a number of woodcuts h 

 been borrowed from the well-known '/<//////// >/< / //'// //////////- 

 h> 'it>n of the last named author. 



The grouping of the ' Fungi imperfecti,' which have not yet 

 been worked up for the German flora, is based on Saccardo's 

 Syll<i>' : hence the arrangement into ////"/".-^--/v/r, etc., which 

 is intended for the benefit of those having access to Saccardo. 

 Particular attention has been paid in the two Indices to the 

 scientific names of both parasites and hosts, to popular names, 

 and to technical expressions. 



In my labours I received great assistance from the following 

 sources: From the collection of pathological material begun by 

 Professor Robert Hartig, and now carried on with my help in 

 the Botanical Institute of the Royal Pavarian School of Forestry 

 in Munich; from the facilities for research and photography 

 afforded by the laboratories of the same institution : from the 

 K'oyal Library of Munich, the Library of the 1'niversity, and the 

 private pathological library of Professor Hartig. 



Living material for investigation has been kindly sent to me 

 from many sources, particularly from tin- following gentlemen: 

 Hen- Lehrer Sehnabl of Munich, (!eh. Oberregierungsrath Prof. 

 Kuhn of Halle, Hofgartner Kaiser of Munich, Prof. l>r. Fries 

 of Upsala, Fi>trath von Ploiuiies and < )herforster l.osch at 

 Amorbaeh. Preserved material came from llevr Hauptlehrer 

 Allescher of Munich, iMrcctor I >r. Goethe and lr. Wortniaiin in 

 < ieisenheim, Pro!'. Ir. Staid of Jena, Prof. 1 >r. Magnus of I'.erlin, 

 I'lof. I)r. (Irasmann and Prof. I )r. Loew of Tokin. Mr. P-runs 



of Frl;ili;j"ll kindly photographed some specimen-: in the botanical 



museum there. Numerous botanists h;i\e greatl) -i'd me l.y 



-iiding pa] ii ! 'eiallv I>r. iM'etel of l.eip/i- : I ha\e also to 



