126 



Mycologia 



semblance to parasitism. As Zopf (20) says, " Oft sind entleerte 

 Faden auf weite Strecken hin von vielfach hin und her gebo- 

 genen Keimschlauchen ganz ausgefiillt. Fast mochte man ange- 

 sichts solcher Bilder glauben, man habe einen fremden Organ- 

 ismus vor sich der als Parasit in den Chaetomienhyphen hause." 

 Text fig. 19 is from an old culture of A. carbonarius where there 

 can be no question as to the nature of this internal hypha. Vari- 

 ous examples of this phenomenon are reported in the literature 

 and I have arranged a number of the references in the following 

 table : 



TABLE I 



References to Self-penetration, Durchwachsungen, Etc. 



Author 



Date 



Species 





...1856 



Lemna minor 





. 1872 



Saprolegniaceae 





...1879 



Marchantiaceae 





...1873 



Saprolegnia 



Kny 



...1873 



Dasya, Hypnea 





. , . 1881 



Chaetomium 



Brefeld 



1881 



Ascoidea 





...1885 



Inzengeae 





...1885 



Ascoidea 





1887 



Epic oc cum, Alternaria, Botrytis 





1892 



Sclerotium hydrophilum 



Klocker & Schonning 



• . .1895-98 



Dematium pullulans 







Ascophanus carneus 







Rhizoctonia 



Beauverie & Guilliermond. . . 



. . .1904 



Botrytis cinerea 





. . . 1904 



Morchella esculenta 







Sclerotinia libertiana, Botrytis 







Gloeosporium nervisequum 







Griffithsia 







Ascobolus magnificus 







Gymnosporangium 



When the teleutospores of species of Gymnosporangium are 

 formed the young spore buds often grow into and through the 

 old buffer cells above (36). If the intrahyphal mycelium found 

 in the powdery mildews is that of a fungus parasitic on another 

 fungus, then it is the only case of the kind known. All of the 

 other examples of this phenomenon have been proved on further 

 investigation to be due to self-penetration, " Durchwachsungen," 

 " d'accroissement perf orant," or self-parasitism, so to speak. 



