PHYLLOSTICTA. 465 



mium joutrefaciens Fuck. This is probably the cause of the 

 gradual blackening of the leaves, yet it does not appear to 

 lose its saprophytic nature. 



Frank also gives Fhoma betae Fr. as one cause of the heart- 

 rot of the sugar beet (comp. Phoma). 



It will thus be seen that the cause of the rotting of beet- 

 root, sugar beet, and mangold is still very obscure.^ 



Ph. galeopsidis Sacc. On leaves of Oaleopsis Tetrahit. (Britain.) 

 Ph. atriplicis Desm. On leaves of Chenopodium and Atriplex in Europe 

 and Britain. 



Ph. chenopodii Sacc. has been found injurious to spinach in America. 

 Ph. podophylU (Curtis). In leaves of Podophyllum peltatum in America. 

 Ph. primulicola Desm. On withering leaves of Primula. (Britain.) 

 Ph. ruscicola Dur. et Mont. On leaves of species of Ruscus. (Britain.) 



Depazea. 



A provisional genus including species of which the spores 

 or conidia are unknown, so that the forms included in it will 

 probably be found to be related to various groups. They live 

 in many cases on living leaves, causing discoloration. Some 

 of them are : 



Depazea acetosae Op. On Rwinex Acetoaa. 



D. impatientis Kirchn. On Impatiens NoU-tangere. 



D. geicola (Fries). On Oeum urhanum. 



Phoma. 



Conidia unicellular and colourless. Pycnidia black and em- 

 bedded, but having a distinct pore. The species produce spots 

 with ill-deiined margins. 



Phoma abietina Hartig^ (Fusicoccum abietinum Prill, et 

 Delac). This parasite is a frequent cause of death to the 

 silver fir. The branches become brown, yet retain their needles, 

 hence when they occur isolated amongst neighbouring green 

 branches they are at once conspicuous. On close examination 

 of the dead or dying branches, areas of shrunk or con- 



^ According to Karlson (Petrowsk. Akad. f. Landwirthschaft, 1890) and Hell- 

 riegel {Zeitsch. des Verein f. Eiibenzuckerindustrie d. deutsch. Seiches, 1890) 

 insects take no part in it. 



'' Hartig, Lehrbuch d. Baumkrankheiten, Ed. il. (English Edition by W. 

 Somerville). Mer, E., Journal de Botaniqne, 1893. 



2g 



