Ervsiphe 231 



able paper mentioned above, the PJivllactinia growing on bar- 

 berry leaves is described as a new species under this name. 

 The author remarks (264, p. 64) that ** die Phyllactinia der Ber- 

 beritzenblatter zwar sehr nahe der P. siiffidta der Haselnussblattcr 

 steht, sich aber von ihr constant vor allem durch die an der Spitze 

 stark gebraunten Perithecien-Anhangscl unterscheidet und dem- 

 nach als eine eigene Art anzusprechcn ist.'* At page 56 (loc. cit.) 

 the same character is more closely described : " An ihrer Spitze 

 sind die vollkommcn ausgebildeten Anhiingsel bei P. suffulta 

 ziemlich stark verschmalert und haufig etwas geschlangelt ; die 

 abgestorbcneu Plasinareste sind sttts farblos und reichen sehr oft 

 nicht bis in das Endc der zart-wandigcn Spitze hinein, an der nicht 

 selten das Anhangsel collabirt erscheint. Bei P, bcrbcridis sind 

 die Anhangsel an der Spitze nur wenig verschmalert ; die hicr 

 vor'handcncn abgcsforbencn Plasmarcste sind iviincr nichr minder 

 stark gebrtiunt und gehen bis in das Spitzen-ende hinein ; meist 

 erstreckt sich die Farbung auf das ganze obere Drittel, und nicht 

 selten reicht sie bis zur Mitte des Anhangsels herab/' 



The brow^n color of the protoplasmic contents of the apex of 

 the appendages is probably best seen in living plants ; and becomes 

 partly lost in dried materiaL In the dried specimens (now in the 

 Kew Herbarium) kindly sent to me by Dr. Palla, the apex of the 

 appendages is yellow-brown, and the appendage has the appear- 

 ance shown at Fig. lyi (cf, pL j. /. 2 of Dr. Falla's article). 



The other minor differences described as existing between the 

 perithecia of P, berberidis and P. corylea certainly do not hold 

 good when dealing with the numerous forms of the latter — as 

 perhaps might be expected from the author's statement that only 

 examples of P, corylea occurring on Corylns in Austria were taken 

 into consideration in making the comparison. 



With regard to the value that should be attached to the pres- 

 ence of the colored tips of the appendages it seems to me very 

 probable that the color is to be considered as wholly due to the 

 influence of the particular host on the fungus. We know that the 

 barberry contains a yellow coloring matter (berberin), and I am 

 inclined to attribute to the effect of this substance on the fungus 

 not only the colored tips of the appendages, but also the very 

 bright yellow color of the asci and spores. With regard to these 



