PHYLLOSTICTA. 465 



mium. initrefacim>i 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 Phoma bctae 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 Saec. On leaves of (laleopsis Tetrahit. (Britain.) 



Ph. atriplicis Desni. On leaves of Chenopodium and Atnple.vm Europe 

 and Britain. 



Ph. chenopodii Saec. has been found injuriou.s to spinach in America. 



Ph. podophylli (Curtis). In leaves of PodopJnjllum peltatum in America. 



Ph. primulicola Desm. On withering leaves of Priimda. (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 Rmnex Acetosa. 



D. impatientis Kirchn. On Impatiens Noli-tangerc. 



D. geicola (Fries). On (Jeum tirhciimm. 



Phoma. 



Conidia unicellular and colourless. Pycnidia black and em- 

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

 with ill-defined margins. 



Phoma abietina Hartig- {Fasicoccum ahidinum 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 e.xamination 

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



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

 fiegel (Zeitsrh. dei Vereiii f. Jiiibenzuckerimlu.'itrie d. deiiiach. Reiches, 1890) 

 insects take no part in it. 



2 Hartig, Lthrhuch d. Bmimkrankheilen, Ed. ii. (Englisii Edition by ^^'. 

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



2G 



