GNOMONIA. I'-.' 1 . 



4 



epidemic disease of the cherry </V"////.s <///////* and 7'. Cerasus), 

 "I served for several years pa-t in Xorth Germany and else- 

 where. The fun-iis attack- the leaves, and there the mycelium 

 UTOW-. Tin- leaves wither prematurely, but rt-main all winter 

 han-inu from the tree by a reddish-brown mycelinni. I'ycnidia 

 and perithecia are produced in the leaves, the latter reaching 

 maturity in sprin-, when the two-celled asco-pures are ejaculated. 

 The pyeuidia contain short eonidiophores hearini: hook-shaped 

 conidia. The fruit is also attacked, ami ripens unequally. SO 

 that the cherries are distorted: then they crack and rot. 



Frank has succeeded in carrying out artificial infection. This 

 takes place in June, and immediately on u'-nninatioii the -erm- 

 hypha produces an attachment-disc on the host-epidermis, \\hem-e 

 a hyphal filament penetrate- the epidermal wall, -rows through 

 the cell, and readies an intercellular space. A thick septate 

 mycelium is formed and spreads, especially anion-st the spon^v 

 parenchyma. There is no stroma, and the perithecia hibernate 

 on dry leaves. 



Frank recommend- the plucking and burning of dead leaves 

 han-iii". on the tree-. This must of course be done throiiulioiit 

 the whole di-trict attacked. In one part of l'n;--ia ( Altenlaiide ) 

 this precaution wa> taken twice each winter for two years, 

 with tin- result that the di-ea>e, which had Ion- i-omplelely 

 ruined the dierry ei- .p, disappeared, and the harvest increased 

 to its former amount. 



Gnomonia quercus-ilicis I'.erl. 1 causes brown >put< ,,n lea-. 



of IJlll-,-1-11* III i. 



VALSEAE. 



Mamiania. 



I'eiitliecia jirodiiceil in a black stmina, from which their Ion- 

 neck- project. The asci have a thickened ajie\. and contain 

 ijlit oval hyaline ^jioivs with one or t \\ o c.-M-. 



Mamiania iGnomoniellai fimbriata I'er-. (Untain and I - 



America i. The Mromala of thi- appear in -nmnier as little 



black cll-hio|]- oil the |ea\e- ,,f the I mM 1 1 >ea 1 1 1 (('"I'/ii/IH*). The 



I'ci it hecia arc' develop,;, 1 in the>e gpots, and their Ion- black 

 beak- projcetiiiM di-tinctly above ihe surface of the leaf cail-e 



'Berli , /.' in >/i r \. 



