346 



Mycologia 



tinue to grow each year a few hundred plants of each of these 

 types in trial rows on soil that is ' sick/ i.e., thoroughly infested 

 with the cabbage Fusarium. From these plants further selections 

 are made with the aim of maintaining the best standards both as 

 to type and disease resistance. Of course, there is opportunity for 

 minor gains in this way, but our experience has not indicated that 

 much improvement is to be expected in this direction. The sur- 

 plus seed thus obtained is placed in the hands of the local cabbage 

 growers' committee for commercial increase in such manner as will 

 best maintain general standards of excellence." 



Review of Klebahn on Life Histories of Ascomycetes 



Haupt-und Nebenfruchtformen der Askomyzeten. Eine Darstellung eig- 

 ener und der in der Literatur niedergelegten Beobachtungen iiber die Zusam- 

 menhange zwischen Schlauchfruchten und Konidienfruchtformen, von Hein- 

 rich Klebahn. Erster Teil Eigene Untersuchungen, Leipsig, Verlag von 

 Gebnider Borntraeger, 8, 191 8, pp. 395- text figs. 275. 



This is one of the papers prepared for the memorial volume to 

 Dr. Ernst Stahl in celebration of his seventieth birthday. The 

 author is already well known for his investigations of the life 

 histories of ascomycetes as well as rusts. 



As an introduction, previous work on this subject from the 

 Tulasne Brothers and Fuckel down is briefly reviewed. The life 

 histories of the fungi covered in this part of the work, including 

 about 40 species and varieties, mostly pyrenomycetes, have been 

 determined or verified by the author. The second part, which is 

 promised later, is to cover similar work of other investigators on 

 this subject. This work will be of great value to all mycologists 

 and pathologists, as the various papers which have been published 

 on life history studies are much scattered and frequently inaccessi- 

 ble to students and sometimes to investigators. Most of the life 

 histories reported are based upon pure cultures from ascospores. 

 In many cases inoculation experiments were also made. The 

 genus Mycosphaerella is taken up first and the life histories of 

 7 species, occurring on various hosts, are described. In some 

 of the species Septoria was found to be the pycnidial stage; in 

 others the form produced was Phleospora. The author suggests 



